[siro_fr]

And by headphones I mean AirPod max/Sony/Bose - any high quality headphones basically.

Any ideas on the best way to do this?

Bose EB works, but that mostly seems to be earphones. I also don't think they let you refund the replacement.

I've been trying to find a place to get Sennheisers but haven't gotten round to it yet

They do let you refund the replacement. Maybe its a EU specific thing cause we've got some really good consumer laws, but yeah, should be possible