OREI HDMI eARC & ARC Audio Extractor Converter – HDMI ARC to RCA L/R Converter with 3.5mm Jack – ARC/eARC Audio Converter for Speaker, Headphone, Home Theater (DA25)

I don't have one, I just have this converter that I was hoping to get by with.

It turns out it has an eARC port. In that case, I'm just going to go with routing an HDMI cable to an analog audio converter like this, then using an aux extension cord to plug my headphones into. It's not as efficient as a wireless bluetooth experience, but the wiring is still minimal enough for me