I recognize that the answer is probably no to this, since I've been searching around FFTPatcher for a few weeks. However, just to put my mind to rest so I can move on, I will ask it here in case anyone has come across the same question.
There are formulas for increasing PA (Focus) and Speed (Tailwind), but there isn't a corresponding formula to increase MA. However, that DOES exist in the game's code, since the support ability "Magick Boost" uses it. Is the formula hidden somewhere (like in formulas 6B-FF), where I could apply it to an action ability, or is this a lost cause without ASM?