Very smart idea!
But one question - You will be able to listen / test for "gross" issues, but in my experience, even with the clutch depressed, just the minor drag on the disk (from both the flywheel and the pressure plate) will spin the internals of the ZF, which will make the drive flanges turn.
You may want to see if you can figure out how to get some "drag" on the ZF hubs, so you can tell if you have "full disengagement" with the clutch depressed.
But you need to be smart about that... for safety.
Rocky