I wouldn't. That pickup is such a delicate balance of everything. Inductance, magnetic circuit, coil wind, etc. There's a reason it sounds the way it does. I'm sure someone can tell a success story about it, maybe Alnico 8 would be an overall improvement now that I think about it, but I think with A5 or A2 you'll have lost all the character.
As for the PAF Pro = Super 2, they're pretty similar winds, they're going to emulate one another if you swap magnets, aside from the pole piece differences. I have a PAF Pro/Super 2 hybrid I like quite a bit in my 24 fret RG. But the inverse is not true. A5 in the original Super Distortion won't make for a beefier PAF Pro kind of sound.