Kind of a simple one, but I haven't seen this out there and you seem to be doing more with momentary switches than others.
Similar to your average true bypass looper, but with a momentary switch, and a toggle for normally bypassed vs normally passing through the loop. Maybe a 2nd toggle for cut off vs continuing to receive the "trails" from the effects loop as well would be sweet.
If you could swing this in the mini enclosure for not crazy $$, these would probably be quicker and cheaper to make then the main stuff you're doing. I for one would be all over using SSBS momentary tricks on other people's phasers, chorus, delay, etc etc.