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Ah, I like the idea of the combi SA and block but I’d need two shifters which could work as the Cyclo I have in the post is band on and the TT has a brazed fitting also? And I think I’ve seen a rear hub brake wheel with a SA and a sprocket on eBay. Hmm.
crossedthread-
I use a Cyclo adapter on an SA AW hub on my Paris tandem and it works pretty well. As you can see in my picture, I have a large cog and a small one and the Cyclo Standard deraileur is able to change between them ok.
The main problem, for me, is that I couldn't get long enough cables, so the stoker has to change the Cyclo deraileur and I change the SA hub from the front.
RgrahamH
Just a thought on tandem gearing
Tandems are fast on flat roads and downhill, but uphill they are a struggle (honking requires skill!). So for most non - racing purposes a low bottom gear is necessary.
I have a bike with a Cyclo 3 speed and I have tried and failed (so far) to find a sensible block. The largest sprocket I've got so far is a 21, but that comes with 3 tooth differences (16 - 19 -21). More common is 16-18-20, but what I'd prefer would be 16-18 and at least 22, and that's on a solo. I've overcome this by using a small inner ring, but this is not possible on a tandem without a crossover drive, which would, I think, be too modern for what you are aiming at.
A possible answer might be to combine your Cyclo with a Sturmey hub, which would give a further 25% reduction. I believe 22 tooth sprockets do exist for the standard 3 spline fitting.
Using a 3 speed mech. with only two sprockets may prove tricky, but would be possible.