Just started shipping their (eyewateringly expensive) crowdsupply version https://www.crowdsupply.com/morpheans/sharpikeebo
Sources and Gerbers available so you could get a couple fabbed at JLPCB or fab of your choice fairly easily https://github.com/ccadic/sharpikeebo/tree/main/V1222
I’d be inclined to run it with an open hardware replacement for the Zero such as https://openkits.easyeda.com/project/detail/lctspi-rk3566-2g-16g
I really do like the concept, but bare PCB buttons are ok for navigation but just awful for typing honestly. Maybe some of those mouse microswitches could be neat