Good idea's. I have a multitude of those Boss switches, singles mainly, just 1 double. Don't have an FM3 yet , but I use to use them with my various versions of the AXefx made over I have owned over the years. Don't need them with my AX8. But I am lookong forward to the FM3...........Yeah, I wanted to keep the size down. I already had the FS-5U switches so I’ll try that first. If that doesn’t work out, I have an FC6 but I really don’t want to use that with the FM3. The two together with an expression pedal are too wide for my pedaltrain.