AmiKey is not a dead project
I had to focus on my family for over a year soon after testing AmiKey revision B prototypes and wasn't able to finish revision C until earlier this year.
Lately I decided to make AmiKey available to anyone for private, non-commercial use so if you need a PCB membrane for your Amiga 500/500+ or 1200 feel free to visit project home page and download the gerbers so you can place an order at your favourite PCB manufacturer.
https://8bit.re/amikey/
If there are some question for which the above project page has no answer I'll be happy to answer them here, just let me know.