Here's my final iteration...
Gokko/Soyan 12" X 18" aluminum pedalboard.
TC Mic Mechanic (vocal).
Behringer IEM Headphone Amp (wired backup for our wireless IEM’s, i.e. no worries about location interferences).
Mosky Dual Footswitch.
Ceba Screen Protectors.
Mooer Footswitch Toppers.
Mono Club 2.0 Case
Custom Patchbay (to save the FM3's connectors from people tripping on cables on blacked out stages).
The whole pedalboard complete with cheap case, DIY patchbay and cabling cost around $100, including clockable XLR's and right-angle MIDI connectors, D-Series punched project box, plus the D-Series 5-Pin DINs and XLR connectors, and the D-Series1/4" connector.
The FM3's FAS Link connector is powering the TC Mic Mechanic and Behringer Heaphone Amp.
FC Setup...
FC1 tap controls the Ableton LIVE Looper Plugin's Play button, and hold the FM3's Tuner.
FC2 tap controls the Ableton LIVE Session Loop button, and hold the Ableton LIVE Looper Plugin's Undo button.
FC3 tap switches Delay FX, and hold selects the Auto-Wah.
The Mosky Dual Switch 1 tap increments Scenes, and hold decrements Scenes.
The Mosky Dual Switch 2 tap selects Pitch FX.
Everything else including the vast majority of Scene changes and cross-fades is automated.
Thanks again to FAS for making the FM3 not only sound good, but also making it be so versatile routing and controller-wise!