The Leopold F660C keyboard with Topre Silent 45g switches isn't silent, but it's an obsession killer. If one want custom QMK firmware, get the Hasu aftermarket controller.

https://mechanicalkeyboards.com/shop/index.php?l=product_det...

https://1upkeyboards.com/shop/controllers/fc660c-controller/

I too have a closet full of mechanical keyboards, somehow indulging the obsession while failing to see the point. A Topre switch is so much better, it allowed me to focus on my layout then get back to work.