I have the 8BitDo Retro Receiver and the 8BitDo FC30 Pro. This won't help everyone else, but on my Analogue NT I set Select + Right to do a short reset, and Select + Start + Right to do a long reset. Something integrated into the cart would be nice.
Oh, and both the 8BitDo Retro Receiver and FC30 work very well. No added input lag, from what I can tell.