You mean the meta key?

Apple’s Bluetooth keyboards have been pleasant to type on, albeit a bit pricy.

LEDs are soldered to the circuit board. The switches then have a transparent channel that the LED shines through.

Keychron has what you’re looking for, and it’s wireless. I have 2 of their keyboards and they’re pretty good and an excellent value.

https://www.keychron.com/collections/keychron-q-pro-series-keyboard/products/keychron-q5-pro-qmk-via-wireless-custom-mechanical-keyboard

As for a Model M with a backlight, yea I don’t think that would work with the buckling spring… there’s just nowhere to put the light. My daily driver is currently a Unicomp New Model M and I just don’t think the shape of the board would make it easy to do this without sacrificing all that makes it what it is.

You may need to email them for support. Boardsource is making a lot of proprietary products and I don’t think there are going to be enough people here to answer questions about their interoperability with other components.

I recommend going to the Boardsource discord and asking there. A lot of what you’re asking is going to be specific advice for their products. The Unicorne case/PCB is brand new and I doubt a lot of people here have one.

Only some fundamentalists believe that Genesis is literal. And not just Christians.

https://en.m.wikipedia.org/wiki/Interpretations_of_Genesis

Rather than pinky stagger, consider the pinky mod. I’ve done this on a Lily58 and Sofle (by removing switches), and eventually the PicaChoc came along: https://kbd.news/PicaChoc36-1853.html