Copy / pasting this from another thread because I need to know if something like this would work in theory:
I had this idea yesterday, and I think it could really work: Proprietary Bluetooth signal broadcaster and Smart Straps.
Hear me out. What if Nintendo sold a $20 set of Joy-Con straps that came with a little Bluetooth receiver / broadcaster that you plugged into the headphone jack of the console. It would be something cute, like a tiny Mario holding a coin, and the coin would glow a soft blue or yellow (or maybe not, doesn't matter).
Then you'd have a normal set of Joy-Con straps, but on one of them there is a headphone jack at the bottom, and the strap itself has a built-in antenna to receive the Bluetooth data from your console.
If using a pro controller you could just sync your phone to the signal and plug in there, and the app would be upgraded to include some audio control options you could adjust on the fly along with the other app functionality whether you're plugged into the phone itself or the Smart Straps.
Would something like this work?