Matt, you would need to do the following:
-Remove old tac switches/paddle switches and toss 'em
-Relocate the USB jack somewhere else; probably in the handle of the controller, in that nook between the handle and the mic port (the existing USB jack location interferes with the location of the new interchangeable blade base)
-Take the interchangeable receiver piece and desolder the flex ribbon cable header off it (you will have to manually install 4 wires to the place where the header used to be instead)
-"Double up" some wires on the Berserker (the four wires going from the Berserker to the LED indicator stay: you need to run 4 more wires in parallel with these, going to the blade receiver base)
-Modify the back shell (adding a slot and two screw holes), and screw in the receiver base, solder those four wires talked about in the point above
I think then you're be good to go. I was just walking through the process out loud, might've missed a few steps, and it'll make more sense when you're holding a kit. So yes I think this can be done but it's going to require some work (enough work that I can't offer an upgrade path for existing Berserker customers to upgrade to the new interchangeable blades).
Long story short, relocate USB jack, modify receiver piece so you can manually solder wires to it (instead of using flex ribbon connector), install receiver piece, install wires to to receiver piece, viola.