So I will receive a PicoCalc hopefully this summer and I plan to modify it to a Cyberdeck. A documented solution is to replace the original Pi Pico with a Luckfox Lyra to run Linux on this thing. The version I bought doesn't have built-in wifi but a weird tiny USB port. The solution is to buy a JST SH 1,25 mm to USB A (female) adapter, then plug a wifi dongle in. This is an attempt to build it cheaper and more compact.
After removing the usb dongle's enclosure:
Soldered the 4 pin JST SH 1,25 mm to the PCB:
Some heat-shrink tubing for the professional look (and isolation):
And here's the result:
Now I will try to install Linux on it and get wifi running so I can just swap the hole thing as soon as the PicoCalc will be delivered.