I have been reading this here & it feels like strong medicine. Would not like to render my machine unbootable...
https://askubuntu.com/questions/1237185/how-to-make-space-in-boot-efi-without-resizing-the-partition
@Lulz4l1f3 well, a) of course, that goes without saying, and b) WHAT AM I, SOME KIND OF A WIZARD WHO BACKS THINGS UP?