yeah, it can be done - Ive done it with a TA cyclotouriste setup on a dawes tandem.

I repeat, there's no need unless you are riding a tandem and want additional HIGHER gearing, like: 20, 32, 42, 52*

but by all means spend your money and time engineering an over-complicated solution in search of a problem. It might even work (poorly). YMMV.

There's a reason that this approach aint common.