That is what I will be doing. No one had the tool locally, and for the shop’s prices to bring it in were much more than ordering it online. So now I am just waiting for it to show up in the mail.
It will take a week or longer to this to get here, so I will just use my inferior unicycle until then.
Are there plastic caps, or anything else, that can be put in the holes on drilled rims to keep crud out of the rim and provide a smoother curface for cleaning?
This thread is hilarious 
Drilled rims don’t really accumulate dirt and washing is still easy if they do.
Plastic caps dont’ exist as far as I know as they’re completely unnecessary.
As said above, really you just need to get out riding more.
When you’re riding every day, you won’t even start to think about cleaning.
I clean my unicycles a few times a year:
I fully understand that with unicycling that significant time and effort must be spent in actual practice. I put in as much practice as I can, when I can.
Currently I have a doozy of a lingering cold. I went out practicing before when I thought it cleared up, and it came back with a vengance.
muni riders do a lot of effort to ride their munis / rims muddy & dirty. 
they are proud that people can see their hard job. 
may be they clean munis / rims before selling, but usually they ride their munis / rims down till they crushed 
;);)
“weight weenies”
Drilled rims save an insignificant amount of weight in a light alloy wheel, more in a heavy one. Better off to get a better rim, lighter tire, and go tubeless to save weight.
Drilled holes in rims increases the amount of maintenance needed to keep a wheel aligned and results in more broken spokes, bent a broken rims.
Just a cost increasing unnecessary vain feature to look cool.
I’m gonna have to disagree with this. A well built wheel will be pretty reliable. I started building wheels back when Rigida rims were standard. Those were soft, and not really round from the factory. The only thing that made the wheels solid was a good build. The current technology in rims makes the rim so much stronger, straighter, and rounder from the get go which has allowed poorly designed low spoke count wheels to be somewhat sturdy. Using these same rims in a standard laced 32-36 spoke wheel makes for an easy build that will be fairly reliable even if it isn’t perfect. That same wheel built by an expert, or an amateur who was careful, will be as maintenance free as any other in normal circumstances.
Granted, if the holes are not well placed, or too big to allow enough support for the nipples you will have problems with rims cracking. To be honest though, I’ve seen more cracked Mavic rims without holes than I have cracked drilled rims.