Switch or change admin - userid 1

[davidw]

What's the easiest way to do this?

I'm temporarily wanting to switch move my userid to another and make another user userid 1. I've read these threads:
https://vborg.vbsupport.ru/showthread.php?t=106064
https://vborg.vbsupport.ru/showthread.php?t=124983
https://vborg.vbsupport.ru/showthread.php?t=76783
https://vborg.vbsupport.ru/showthread.php?t=71183 (which looks helpful but is a couple years old)
https://vborg.vbsupport.ru/showthread.php?t=48253 (which also looks helpful but very old)

The reason for this? Impex issues. The admin with one vb board is different than me (of course :P) and it wants to merge the old admin into me. I can't change the old admin (I only have a copy of the sql and files).

I figure the best way to fix this is to move my account, posts, etc. to another user ID and then promote the admin of the other site who is also a member, to userid 1 temporarily, do the import, and then switch back. Sounds great on paper.