That's why I was thinking one person should do it on the same wheelset/tire combo swapped from bike to bike over the same course.

But really, what will that tell us?

I think it would be easy to setup some sort of laser reader to detect flex in the frame on hard sprints, climbing, etc.

But that's really a test of the bike and it's engineering and not the material. Both of those tests would be measuring the bike and not the material.