Can I convert an 820-0044-C II+ to II?

I think it may be a while before I see a Rev 4 or earlier A2 board on ebay again, but if I recall some previous threads here correctly, I *can* make a II+ board function more or less like an original II board, correct? It's simply a matter of swapping out the ROMs? I've got an 820-0044-C in decent condition I was thinking of using for the task.