This is a very preliminary port. It supports a disk on flash where you can save C programs, which can be compiled and executed on device (YES!!!). The terminal emulator is not properly plugged with pshell, so some keys (such as arrows) do not register. Tested on pico1 and pico2. You can download uf2 at:
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Hi, Ben!
I love the idea of pshell having ported to PicoCalc. I tried to install it, but it seems that after booting it stucks at the first step - pressing y button to format flash.
My guess is that the issue is that the BIOS is updated and v1.4 keyboard mgmt is changed.
Can’t you please look at it to fix it?
Attila
UPDATE: it somehow started to work 
One more reply: this stuff is so great! It would deserve way more interest here! There is so much room for improving it! (Including SD card support, graphics support, etc.)