That look like a really great solution!
I find fumbling for the arrow keys with one one outstretched arm whilst holding a holding a USB-microscope with light in the other and trying to focus on where the probe tip is located to be one of the least satisfactory parts of the Voltera experience.
I do have a Pi-Zero-W and Pi-Cam waiting for me to find time to try something similar, this should give me a push!
Which camera did you use? Any downsides you have found, or tips on setting it up?