Well, I will look into getting a modded PSP then....I just ordered a used copy of MUA 2 for PSP from Gamefly today...it is due to be delivered on Friday.
One thing I would geek out on is if all of "Caps Kooky Quartet" could be playable in this environment. Quicksilver is a boss villain in MUA 2, Scarlet Witch was playable from XML2, Hawkeye from MUA 1 on PSP, and Captain America from both MUA 1 & 2. We got the makings of most of the great Avengers from their past (aside from the ones mentioned above):
Thor (MUA 1&2)
Iron Man (MUA 1&2, XML2)
Black Panther (MUA 1)
Black Widow (PSP MUA1, MUA2)
Ms. Marvel (MUA 1&2)
Hulk (MUA 2)
Hercules (MUA 2)
Wonder Man (MUA 2....YES!!!)
Only ones I would miss are Hank Pym (Antman or Yellow Jacket versions), Wasp, and one of my favorite Avengers of all time, Hank McCoy a.k.a. Beast!
EDIT: Hmm. Easy peasy mods for me, since I have a PSP 1000. I can actually get everything pretty much pre-done for less than $50 including shipping, that would be for a Pandora battery to downgrade my PSP to firmware 1.50, and a Magic memory stick to put custom firmware on it to run games from the stick. This is getting even MORE exciting as I look into possibilities.