Headphones

Just mustered up some change to get myself some The MEZE 99 classics, and altho I know the wired quality is much better, I do walk around with my headphones on (even not playing anything just as habit).

for starters, i want it to be bluetooth (or wifi) whichever is better quality, if possible both, so i can use wifi on my computer (not to lose quality) and Bluetooth on my phone.

second option that i really would like to have more than anything is that i want to be able to hotswap batteries. i even got some very shitty steelseries headphones just because they have that option. I want to be able to charge one battery outside of the headset and have it ready to swap with the one inside the headset the moment it is low.

and the third thing is that i would like to make it not look like im wearing a bomb on my head. the sleeker the better.

I am into a lot of DIY so I'm open to any sort of 3d modelling for extra equipment on the headphones. 3D printing and such are on the table, i do know how to solder but i dont know much about circuits.

TLDR: i need options to make MEZE 99 classics wireless while not losing a lot of quality and having hot swappable batteries.