This is a really good read, thanks for sharing it! I'm currently in the process of deciding how to move forward with the sale of the keyboard I designed so this is all really relevant information for me.
I’m just disheartened on the number of otherwise beautiful keycap sets that fail to use symbology for special keys. I’m talking shift, tab, enter, backspace, caps lock, num lock, home, end, page up, page down…
I'm looking for unix keycaps, I'll end up designing them myself and having them printed.
At about 150 dollars at most, it's probably the simplest way to get what I want. Must simpler than endlessly waiting for a group to come up with what I want.
I've done a couple of boards worth of lasering dye-sublimation markers into PBT keycaps. It comes out pretty nice, and blanks from Amazon or AliExpress are cheap.