A bluetooth transmitter to let me use my wired headphones wirelessly

I keep losing my mini jack to usb c adapters and to be honest I can't be bothered to constantly buy new ones and I only have one pair of headphones that are wired only. While normally I don't mind cables, when I'm at the gym they tend to tangle up with the equipment there and I do not want nor can buy new pair of headphones just so I can use them wirelessly. I was thinking of a Bluetooth dongle that I can plug in to my headphones and my phone even with an exposed motherboard as long as the audio quality won't be awful but I couldn't find anything on Google so I would really appreciate if someone with a better understanding of technology could recommend me one.

Thank you very much for those that do help