Thank you! The 4B version worked just fine for me. I only had to find config.txt, which was under /mnt/boot/ , and to get there one needs to type “login” at the HA console. After editing with vi, reboot now does it.
Now all there is left to do is figure out how to do the same for the SSD adapter, which has a bright blue LED blinking furiously under the pi, another red one on the bottom, and another, dimmer blue one on the SSD itself. I guess tack glue will have to do.