Good to hear that backwards compatibility with the schlumpf hubs is being considered. There are still other isis hubs available, but the KH cranks have my preference since they prevent accidental switching.
In the mean time, before reading this remark, I did buy myself a spare set of spirit cranks. I do have 4 unicycles with spirit cranks so one way or another they could always be useful 
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Sure, but one issue is that once you shove an adapter onto the ISIS hub, you have to be able to take it off again.
I don’t think you could also fit the crank remover threads within the diameter of the Q-Axle interface
One potential solution is a split adapter that you clamp the crank onto first as then you shouldn’t ever need to pull it off.
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That’s what I was thinking along the lines of – it seems a bit like the worst of both worlds though, having a thin adapter relying on the clamping pressure of the crank holding it all onto a tapered spline. I can just imagine them working loose.
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Another option that would work better is a separate puller that works like the nice nimbus bearing puller to get the adapter back off. We don’t necessarily need self-extractors.
The issue I see with that is that there is probably not a lot of space to get the hooked ends of a puller in, especially if you’ve got spacers in place – and ISIS is supposed to seat up to a hard stop as far as I am aware (I don’t want to reopen any space/no-spacer debate for Schlumpf hubs which I seem to remember there being).
Also, given the deformation that occurs on actual ISIS cranks, which would have much more material in the ‘big-end’ of the crank than an adapter, the adapter would be relying on the crank arm to stop it being stretched out of shape. In addition you’d be relying on a bolt into the end of the axle/spindle to keep the adapter on. That is the thought process which basically lead me to think of a split adapter that was just clamped on (as mowcius suggested above).
Anyway, I might be being pessimistic about such things, and maybe the actual solution is completely different 
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My thoughts are more that the Boundary crank would clamp onto the adapter, closing the split, and then you’d force the adapter onto the ISIS hub spline with a bolt as normal.
The act of forcing the adapter on would also tighten the adapter-boundary crank interface as it tries to split open again.
I see no reason why it shouldn’t be as good as a simple ISIS crank mount.
Then removing the crank you’d undo the boundary crank, remove the ISIS bolt (that should then be loose against the adapter) and the adapter would just fall off.
Mmm, yes I’d love to spend half of the cost of a basic unicycle on yet another custom unicycle part puller 
The adapter wouldn’t be all that thick, so I’d be concerned about the possibility of enlarging/cracking it if you were to mount it without a crank already on it, or damaging it when trying to remove it.
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Fair enough, I could see that that could well work better. The pinch bolts are just under tension when you force it on and you don’t have to apply any more torque to them to tighten the thing up.
UDC U.S. has listed the new '23 KH line up but the product description of the 29" still has some of the old.
The external disc brake is a major advantage on the larger wheel of the KH29 because it allows wider hub flange spacing, maximizing wheel strength.
I personally am sad to see the external rotor and symmetrical/wider hub spacing become a thing of the past 
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What do the Rollmops do or permit?
They provide a wide, predictable surface to stand on. Rollmops crank extensions enables smoother and more stable crankrolls / Rolling Wraps.
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They enable you to keep a cleaning supplies closet more compact (as mops are taking less space when they’re rolled…).
{This message is probably approved by @harper 
)
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As qu-ax is a german company, rollmops in german are savoury rolled herring bites
Rollmops are a typical German fish speciality - the name alone would probably be difficult to translate. The sour and savoury rollmops have made a career for themselves as a hangover breakfast. But the rolled herring bites are also delicious as a snack, on a buffet or for dinner.
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I was always quick to defend the external disc setup, and I still use and like it on my braked unis. But I think this is good news for muni and road riders. Common standards are better for everyone, and Q-Axle is a technically better system than ISIS.
That said, I’m sad that this means the end of Spirit cranks. I run Spirits on all my unis (braked or brakeless) for the heel clearance. Zero Q cranks will be the only choice for ISIS hubs once current inventory is exhausted.
I wonder if Nimbus will eventually shift over to Q-Axle? I suspect they’re too invested in ISIS to change any time soon. It would be nice to have one standard across the board.
I guess my 125mm EDB 36er is even more of an endangered species now…
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Would this be an alternative? It extends the pedal axle by 16mm - 20mm depending on the model
Practically: yes. Aesthetically: no. 
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future Schlumpf adaptor + KH Bundary cranks is the solution
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I’m not quite sure it it actually is functionally the same, with pedal extenders you can still accidentally place the front of your foot very close to the axle, while with a high q-factor crank with heel clearance you can’t.
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Our ISIS ZeroQ are end of life, too - we are only running out stocks.
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