A simple idea really, offering up tokens that allow people to change their class and faction respectively.
the class change token would do exactly what it sounds like, change your class, with the trade off being that you would have to level up the class skill lines as well as said skills in the skill lines from 1 again [but that takes what.. 1-1.5 days tops at cp160+]
The faction change token [which i think most of you came here for] would work as follows..you buy it..use it, and boom, you change faction..no timer, no limit, no restriction
HOWEVER it will come with one drawback, a traitor debuff for the faction you left [i.e. if you went from ad to ep, you'd have AD traitor debuff] which causes you to take an addational 50% damage and deal 25% less damage to the faction you came from, lasting 15 days [debuff timer ticks down even when logged out, much like the bite timer for WW/vamp..entire reason debuff exists is to discourage people from bandwagon hopping across factions to "the winning one" every time without conquence]