
Pat my Head:
If i get what you mean correctly... the entry number in Custom List is actually editable. If you edit the list, you can double click on the number with #, type in the target new entry number, then click elsewhere. It will move to its new spot.
::facepalm:: how have i missed that? aside from it being tiny, my eyes being old and my brain requiring dark mode.
thank you
edit: dark mode - it's a tiny grey shadow in dark mode. the rest of the interface is either white or the long grey bars. light mode is black on white, obvious there.