In prep for having HiPro caps again, and because I needed to swap in my purple sliders to my 87u 55g I went ahead and figured out a way to fix the issue with the pesky slider in the bottom left CTRL to make it compatible with HiPro and 104u caps. The guide is up on KeyChatter
If you shave the edge of the housing down that's closest to the LED spot, you don't need to desolder the LED. I forgot the exact spot to shave from, but I'm sure it's mentioned somewhere in my post history if someone wants to look for it.
Still hoping for a solution that doesn't involve cutting the plate. Tried finding one a few months back by cutting a full-size housing, but didn't have any luck.
edit- corrected myself, it was the slider housing- not the slider.
edit2- old pic i found (shaky hands = non-precision work huehue)-