Get a friend to do restarts, go to conn and mount his ID (of the faction you want greenness).
Using this method, say you wanted to make him LN/LPI, mount both of those, then mount each corp ID for Liberty (DSE, Ageira, Interspace etc), may take a while, but you can make him whatever you want and it will be quicker than shooting NPCs/messing about with bribes.
Bear in mind though, you can't have two different IDs on same char, so just make sure you sell your old ID first before mounting new one.
Might need to take some bribes afterwards due to rep-hack combos (mount OC, makes Corsairs hate you) and do /droprep a few times for correct IFF.