I have a Schlumpf MD on my ICE XL trike with a Rollie, and they compliment well. The 3x9 rear hubs like the DuoDrive get most of that done at a lower price. Not as elegant, but accessible price.
I know you are a fan of greasy finger/heel shifting, and it sure is simpler, but I don't enjoy putting back chains that have jumped, and that tells me you have more patience and forethought than I, bob.

I was able to build up from spokes cut by a great ebay guy after checking the length on several of the online calculators.
childhood_dreams, He was very Competitive with blank spokes and has quick turn around. It was fun to learn about this part of the bike, and was simpler than I anticipated with no real surprises.
Small bench spoke cutter prices have shot up, and a nicer one is hard for me to justify
Specs for the hubs are very easy to find and dishing/offset is pretty easy.
As in anything the first one is slow, at least that is what my mother tells me. The rest are easy.