All other measurements being equal, does a higher bounce angle raise or lower MPF?
just a comment as Britt will have a more specific answer.
MPF is a mathematical formula, so all things being equal as you mentioned, would indicate that bounce would have no effect on the MPF.
On the other hand, if you would increase or decrease bounce, that may affect vcog, moi or rcog, etc. which of course would change the mpf (but all things aren’t equal then).
the following link shows how MPF is determined for iron heads..
If someone was prone to striking it a bit high on the face, would bending the irons weak to increase the bounce be an effective way to raise the vertical cg a bit?
Not really. it might even lower it depending on the rearward cg location. Truth is, we want to drive the vertical cg under the cg of the ball. That is what creates solid feel and optimum trajectory. Trying to hit the cg of the ball directly on the cg of the iron head is a difficult task. The goal is to be at or below on the strike.