I had a look into doing this and I can't do it, but there is no code for doing that with any other version of Resident Evil 2 either.
I should have legit saves though unlocking everything if you want those, I would need to looking into backing those up though as I am using my Wii to play those, they are PAL saves though as I live in the UK and have the retail discs.
I have saves for all the GC versions of Resident Evil except for 4 that I replaced with the Wii version.
You might also be able to find saves online but not looked myself, anyway using a save to unlock anything that is unlock able makes it so you can just enjoy the game rather than worrying if you have done it in the time limit and save as often as you like, personally I would even play it without using any of the extra weapons on your first play through of all 4 possible plays (Leon Games A and B and Clair Games A and B that are all slightly different (very different comparing game A vs B though)).
P.S, the GC also has a great remake of Resident Evil (New Graphics, very sexy, New monsters, puzzles and area's, overall it is the same game though) and also has another exclusive called Resident Evil 0 (or Zero) obviously placed before the Mansion featuring Rebecca Chambers.
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