This thread was very helpful! Thanks for the info and ideas.
I have designed and 3D printed an adapter to allow my Trek Roscoe (Boost 141QR) to work with the Zwift Hub and it’s working great so far. I have a metal one on order from an online CNC service, but so far the 3D Printed version is working great. I printed it out of Carbon
Fiber Nylon. I have uploaded my CAD files to printables for anyone to make one for themselves. Just search “Zwift Hub Boost 141 Adapter” in the search bar for printables and you should see it. Sorry it won’t allow me to add links, so I can’t add a direct link.