comments:
DrumBalint posted on r/headphoneadvice3w
I'm looking into this same thing, and what I found is the Philips SHP9500 + BT receiver unit. I did not get it yet, so no in-person experience, but these adapters are said to be OK quality. https://www.amazon.com/YOCOWOCO-Wireless-Bluetooth-Adapter-Headphones/dp/B0DKXGZWN3