Absolutely, I think your request is reasonable, but my opinion won't count to your supervisor. First I'd suggest documenting everything in case you need it. You have disclosed your hearing loss to your employer and a Bluetooth connection is a reasonable accommodation and generally easy. I find that a bluetooth connection between my phone and hearing aids works well for me. There are other ways to make that connection too depending on what kind of phone you're using. And, for me, I'd have difficulty giving 100% to both tasks simultaneously. If that's true for you, you should tell them and document that too. Good luck.