I just test fitted my 05’ ZOO! biketrials cranks to the moment hub, and they fit. All Echo, ZOO!, Adamant, Czar, and GU bike trials parts are all made by the same company. So cranks by any of these “companys” will work. I rode with Kris in Telluride, and he was using Tensile cranks, so those obviously fit.
I had to make a trip to the post office, so I took the cranks along to compare weight.
ZOO! 170mm (one crank) = 9oz, 255g
Moment 137mm (one crank) = 11oz, 312g
Moment 165mm (set) = 682g <from krisholm.com
edit: biketrials cranks are made to use a thread-on cog, or freewheel, so there is no spider to get in the way.