While i do have K100 RGB with OPX switches, i haven't had time to take it into service as of yet. Currently using Corsair Strafe RGB with Cherry MX Silent switches.
Best I can find the switches I see the LED and the photo-sensitive element are soldered on the PCB under the key. Do you have a fefferance that shows otherwise? I had a herd time finding pics. May be later modals are like you say.
Thank you, g