Casey LissEveryone probably knew this but me, but you can absolutely pair a Switch 1 Pro Controller with a Switch 2.
You naturally lose out on the chat button and headphone jack, but in terms of gameplay, everything works fine.
NowWeAreAllTom@caseyliss so far it’s been my preferred way to play, but as far as I can tell it can’t wake the Switch 2 from sleep.
Ezekiel 
@tom @caseyliss yes this is an official limitation due to a change in hardware design. Switch one doesn’t wake up via the Bluetooth signal