Well, if nothing else I'd imagine you'd have to change the 500kΩ push-push tone and volume pots for 25kΩ pots for the EMGs, which is doable but could be challenging with the addition circuit boards inside the Majesty cavity. Whether the Game Changer switching system is specifically expecting 500kΩ pots, I would suggest giving EBMM customer service a call and asking them for advice. They are the best people to talk to.
Also, you are probably already aware that EMGs have square tabs that will need to be altered to fit the triangular tab rout for DiMarzio pickups, but even then, I have heard of EMGs being a slightly larger than some cavities for passive pickups.
I can't promise it'll be easy.