Hooray!!
I figured out how to transfer memory cards from one GameID to another. If this has been said before, I'm sorry, I just figured it out, so I figured I'd share

Basically its pretty simple. If you have old saves you want to use on your new GameID'd PSX Game, just rename the folder in /PSP/GAME/SAVEDATA to something else (say, OLD_GAME_SAVES). Then, start your new PSX->PSP converted game with the corrected GameID, and get to a point where the memory card is accessed (for me, I'm working with FF8, so I simply went to 'Continue' in the main menu and checked the memory cards, which, of course, were empty) Then, shut down the game, and access your MSPD however you normally do (either over the PSP, in a card reader, telepathically, etc.) Navigate to the savegame folder, and see the new directory which is named for your corrected GameID (or however else you named it). Then, just copy ALL of the files EXCEPT CONFIG.BIN AND PARAMS.SFO from the *OLD* memory card into the *NEW* directory, overwriting anything in there. Then, just boot up the game, and viola! Your old memory cards are usable! Now I can finally finish the Dollett Comm. Tower portion without starting over

Just thought I'd share, and good luck to you all!