Still not finished, but I'll write about what I have.

I built up, mostly, the programming sled that I'd designed earlier.

As you can see, it's still in "test mode" orange wire bodgery. Those inner, long rows of headers are intended to accept some pogo pins (shown in the back of the picture!) for the uMesh to be pressed down onto. Outer, more standard 0.1" headers are provided for whatever else someone might want, especially if they want to solder both boards and use as a complete package.

As an extra-special bonus, those tiny inner headers match the programming pins of an ESP-WROOM-32 module! Just like the uMesh, you could choose to put pogo pins on that one, and press it down on this sled to be programmed.