75% Barebone - Good Options?

Hello everybody,

I currently have a Royal Kludge RK L75 keyboard with some custom switches and keycaps on it. I'm looking for a replacement because the keyboard is out of warranty and the volume knob broke. Customer support couldn't do anything for me.

Honestly I'm just looking for a barebone / cheap keyboard that I can swap my switches in. Below are some requirements that I want. My absolute maximum is \~€75

* Has a 75% layout * Is hot-swappable (obviously) * Has tri-mode connection (2.4Ghz/BT/USB-C) * Has a volume knob * Supports QMK/VIA * Is gasket-mounted

Does anybody have an idea what kind of boards are good at the moment?

Thank you in advance!