I've figured out how to get the elite trophy, yes it will be a little hard to follow, but probably not
Step 1- make a save on hard in the English us
Step 2- get past the first elevator and save (Make sure it is on the 1st storage slot and 1st save slot)
Step 3- use save wizard (Only use the dev mode code)
Step 4- load the save and go to sc10-14, Find s13a (you will now be in blast furnace) walk backwards and walk back into the blast furnace it will now go to disc 2 save
Step 5- use save wizard again (Use all the cheat dev mode, all items and weapons)
Step 6- load the save again and go to demo all - disc 2 - find s2801e0 (If you see a cutscene where solid snake is on the snowmobile you've done it right)
Step 7- enjoy