Bluetooth arcade stick?

Im about to make an arcade stick soon and I had a couple of questions regarding the build, I am new to this but id like to get it right the first time.

My current build is based off of the hitbox aracde using a cthulhu pcb with a flashed audrino for horizontal SOCD. Link below.



I would also be using a Cronus max and bluetooth adaptor if usb functionality is possible. Either way I plan to use the Cronus for maximum cross compatibility though.

1. Is there a way to add bluetooth functionality and charging to my arcade stick?
2. I would also like some basic led display that displays the current battery level, possible?
3. Is there a way to also change my output to mini usb?
4. I would like to have the option to use a headset with it which I see the "PS360+ PCB" supports but idk if the horizontal SOCD works with that pcb. Would anyone know about that?

I know the build seems a bit picky but I feel like if I'm gonna make one I might as well go all out. If anyone has any solutions to this that would be amazing. I'll post finished build when I'm done too because I'm getting a metal case built

ps: Please address each question separately.

Thanks in advance