I will be experimenting with putting some DiMarzio Imperiums in one of mine shortly and I will post when I do. I contacted Dimarzio about pickups similar to the Illuminators, but with less output, and the Imperium set is what they recommended.
The Illuminators that come on the Majesty have custom PCB baseplates. The connectors are sort of like motherboard connectors for certain cables (e.g. fans), or similar to connectors I have seen on some EMG pickups, for lack of a better description. As a result, other Dimarzio pickups with matching connectors can be swapped in and out without soldering. Obviously, soldering is an option, but I took one look at the Majesty's control cavity and decided to pass!
Good luck with your mod! Looking forward to hear how it turns out.