Clutch Pedal Doesn't Snap Back

That "snap back" is one of the functions of the over-center spring.

Spitballing:
I'm wondering whether a lighter OC spring would do the trick--pulling the pedal back after the center point while allowing the return force of the clutch to push the pedal far enough for that to happen. It would certainly require experimentation to find a workable solution (if there is one).
The other option would be configuring a simple return-only spring on the pedal itself rather than using the factory OC spring peg. You'd probably want to be higher on the pedal and use a relatively short spring in that case. It just needs to pull the pedal back, so it certainly wouldn't need to be a monster.