I'd actually like a mod the other way round: There are a bunch of great mechanical keyboards (such WASD V3, daskeyboard prime or many other amazing custom builds) but they are all wired. I don't know why they don't make proper mechanical wireless keyboards (they are bulky enough that a battery should easily find space). But a wireless conversion mod would be the next best thing.

Due to my (unchangeable) desk situation, wired keyboards aren't really a possibility, so this is a real gap in the market for me and I was quite surprised, given the extreme multitude of keyboard models in the world, that I wasn't able to find one (or even have one custom built within a reasonable price range) that ticked all the boxes.

Unfortunately, my electronics talent is by far not good enough to attempt something like the linked article (but in reverse, as it were).