I've realized I forgot to post this here because I didn't know where to put it (don't we need a Switch section?). Anyway, here's a video and a little worklog showing off this fairly simple mod to make the Switch compatible with Bluetooth headphones. Worklog: The headphone jack still works as normal. It even works while Bluetooth headphones are attached, so you can have dual output if you want. The transmitter itself is good for connectivity and quality, but not for latency, so I'm interested in updating this with some kind of aptX Low-Latency transmitter.