Bike Friday buys 24 hole rims, for their Tikit.
you can lace a 36 hole hub up, just leave out 1/3 of the spokes.

want a wider ratio range? , Use same hub, + Schlumpf 2 speed planetary cranksets.
2 overdrive and 1 reduction gear type.

I dont care for the -drag the chain down to almost in the dirt-
way derailleurs work on wee wheels. but thats just me..