Ok, where I think am is the option for rotation=90 is not there, so I can’t rotate.
In one of the links, they only get access to the option for rotation with dtoverlay=vc4-kms-dsi-ili9881-7inch, after they update Linux to 6.6.63 (Enable Raspberry Touch 2 rotation with overlay by foonerd · Pull Request #6480 · raspberrypi/linux · GitHub).
Not sure how I go forward, I suspect I might be better off with a different screen at this stage?