One of the project's earliest followers and contributors has started a crowdfunding campaign to produce a batch of Zamek-inspired keys based on a more reliable button design: https://www.crowdsupply.com/depbit/zerokeyusb

While I couldn't make the original trackball/trackpad design happen, I'm happy that people's digital lives can be a little more secure using something kicked off here :)

Best of luck to ZerokeyUSB!