(I forgot - the stock plate will take the Goldpoint switch)
Yeah, there's always some risk when you go off the paved road so to speak. The burdens of risk fall under the "Y" of DIY in situations like this.
Do bear in mind that this is all a moot point for me, as I would just make a banana plug to 4 pin XLR female adapter and not bother with the 4 pin XLR jack on the SEX amp in the first place. This would maintain the resale value of the kit, its ability to drive speakers and headphones, and it would add the balanced headphone out (provided of course that you buy the switch kit).