All should unlock their PS2 with the memory card exploit, the FMCB softmod!
You can DIY or buy one (I only know to DIY with SwapMagic v3.8 disc and no no damage involved it just runs the installer!). Sells for peanuts usually just as little as a stock genuine memory card
Codebreaker v10 patched to kick you back to wLE and run game from any medium is handy sure, PS2rd though much slicker easy you'll just edit the cheats.txt as desired
When you have FMCB card you could get my PS2rd last page have it on the USB power up hold R1 so you're straight to PS2 filebrowser and launch it!
EDIT: Those PSU saves too highlight them click R1 copy them from LaunchELF, psupaste into memory card!