Adjustable Bike for Smart Trainer?

I love Zwift and my wife wants to give it a go. We are very different in size, so she won’t be able to use my bike. Switching bikes back and forth every time is going to be a pain (and her bike has the wrong gearing – I have 10 speed; she has 8… Converting her bike to a 10 speed would cost almost as much as a new moderate-level bike). Really don’t want to spend on a second smart trainer if I can avoid it.

SO… I was thinking of the sort of bike you sometimes see at a gym, with a wide range of easily adjustable handlebar reaches and seat heights. Anyone ever seen such a beast connected to a smart trainer?