If we were to do something like that we'd have to come to some geenral agreement on the game system, or make one up. Or...
We could make the sourcebooks system neutral, maybe use terms like EASY, NORMAL, HARD for skill tests and what not and then a one page sheet that says what Hard means in CODA, ICON, FASA, or whatever.
Just getting us all to agree on a system is going to be quite a hurdle.