So it all depends on your level of comfort. Anything is possible.
I haven’t tested on the SNES Classic if the “click” on its own can trigger L/R, since it’s not possible on a regular stock controller to “click” the triggers without a full press on the analog portion.
Plus, I already have the additional circuits in place (as posted above) to get the “click” working in conjunction with the analog trigger press.
Classic Controller Pro are probably easier to hack, since there’s no analog triggers, but I can’t say for sure as I haven’t done that myself either.
No idea on the 8bitdo wireless mods. The theory on all padhacks is the same, so as long as the PCB is common ground, it should be fine.