The idmatch stuff looks pretty high tech and interesting, and I don’t mean to derail your question away from that.
I just wanted to say that there are bike fitters in the US with adjustable bikes jigs that will fit you without a bike. E.g. they might have a Wahoo Kickr Bike and fit you to that, or something more specific to bike fitting like a fit bike from https://www.retul.com/. One I’m aware of in the Seattle area is Seattle Bike Fitting – Métier.cc (see their “new bike fitting” option).