If you do want to renumber a user, there is an easier path to this without a complete database dive by creating a dummy new user without any posts with the member# you want, and using UBB's merge user functionality to move all the posts and PM's over to that dummy account. Rename it, and done.
Still don't recommend it though.
The question was to change to member #1.
If #2 is still valid then your suggestion would work to change to member 2.
