I like what I see...
Did you think to pull/bring out the 0.05" spaced connections?... this could become a universal shim with the extra of having a USB host added to the PICO and have it breadboard friendly.
Just curious (without looking what difference is between the pins used to drive U1 and the 0.05" spaced pins): What is the reason to use other pins than the 0.05" spaced ones?
Since the device you mentioned has also GPIOs, why not make the shim longer and bring them in a row as well? ...or make a double header? Of course, double headers would not make it breadboard friendly...
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