I don’t know what normal trials unicycles come with as far as cranks go, but I have a KH 20" trials uni, with 150mm KH moments cranks (came with it, used) and they are just a bit longer than I’d like. They are used, and have some scratches and scuffs, but I’m by no means a “good” rider, so they haven’t seen much abuse.
I will get pictures tomorrow, but I’m wondering if anything is looking to maybe trade smaller cranks. (preferably the same kind)
I’d also be willing to throw in a little bit of cash if you have a better [smaller] model of cranks.