We highly recommend the GK61 mechanical keyboard as the best hot-swappable keyboard for you. This customizable keyboard has a solid build and compact size, 60% of a full keyboard.
The keyboard has a printed circuit board (PCB). And the circuit board features pre-soldered RGB lighting. So every switch is backlit. However, the keyboard does not support optical switches. You need to use the Cherry MX switches and clones with it.
Additionally, this kit supports 6.25u space as well as split double space. And the circuit board along with the keyplate is screwed to the metallic case. So you need to replace a non-replaceable GH60 size plate if you want to replace the normal GH60 case.
Besides, the GK61 PCB is fully programmable with the GK software. It’s a wired kit as well. Though you can’t change the Fn key position. It’s the last key at the bottom.
Also, remember that this is the PCB, plate, and case only. There are NO switches inside. So, you have to order a set of suitable Cherry switches by yourself. But since it’s swappable, simply put in the switches into PCB. No soldering necessary.