The SKS Rennkompressor is a great pump, but it is optimized for high pressure bicycle tires, say 80-120+. I agree it is very solid feeling and high quality. The head works well enough for me, though it does tend to smack you in the fingers when unlatching it. I only use presta, so I'm going to swap it for a Hirame.
As I said previously, the higher volume, lower pressure
SKS Aircon seems to be more aligned to the OP's needs. The 3 speed bikes only likely need 50 psi max. The pump is max 87 so it could pump "10 speeds" in a pinch.
OTOH, a the lower volume high pressure Rennkompressor will be easier to pump per stroke.
The only semi negative thing about SKS pumps is the PSI indications are hard to read. I've gotten used to thinking in atmospheres/bar.