Ah. Yes, you wouldn’t want to tweak them by hand even if there were a serial console. Or maybe automation talking over the serial console would work? IIRC there’s a DT overlay that enables serial console, and you could patch that in, but…
Right, patch that in to the image before churning out copies for a lot of boards. Or install sshd on the image before copying (but that leaves all the many machines with the same host keys, but that can be changed by the automated scripts and might even make running the scripts over ssh slightly simpler…).
Hah, found it. This Slipstream thing lets you run in the image through the wonders of emulation. The slipstream-examples repo is still empty. ¯_(ツ)_/¯