So you asked for an LNAB change, and got no response.
So you tried Plan B - create new profile and merge into it. This is the same thing that the LNAB change form does, but it doesn't need the PM to do it.
Fine if it works, but if it gets blocked, then you've got two.
No I don't know how it's supposed to work. We have many many thousands of profiles with LNABs that don't conform to the rules of WikiTree. They could be fixed on sight, 10 seconds, instead of which they'll hang around for ever, because total control is given to the PM. So most people just ignore them when they see them, because one way or another they could easily end up wasting an hour on a 10-second job and at no point would they be having fun.