I would like to suggest my wooting keyboard. It is not quiet but i think their switches should qualify as linear. Not sure about the layout but I have the german layout so that might be a "yes"? I have the 100% variant. Sorry, i am not very deep into keyboards.

Their config tool is basically a website, so as long as you have a browser with webusb support on a system it works. Had some problems with the udev rules (most likely a "me" problem), so I used the desktop version instead.

Bonus you get is that the switches are an analog input. So you can change mode to analog and have like "slow walking" in games. Though, I have not tested that yet.

BUT it is hella expensive.

I also have cheap paddles (i think that that is the right word?) off amazon i use often. But the "support" is basically that the config is saved on the device so you config it once in wndows and that was it. I just bound it to random keys once and assign them in games. Would need to dig up what the paddles are called though.