Very Adjustable Bike option

I have a kickr and do some basic lactate testing for clients. I have a number of people interested who aren’t cyclists, but want to know some HR zones etc. I used to work in a lab with a Velotron and SRM bike, which we could change basically all elements of the bike fit very easily. Does anyone know of a good option to do this on the Kickr? Perhaps an old Velotron frame would work?