I just bought a DreamGEAR MiniKey for a mini cyberdeck build. Only problem is it doesn't have a Ctrl key, so I'm trying to map Ctrl to a GPIO button. This keyboard is USB (not wireless) and measures 83mm x 54mm (smaller than an Altoids tin), and I'm fairly sure I've seen .stl files floating around if you need to change out the enclosure.

Prototyping pic: https://i.imgur.com/Hhe9qUh.jpg