I see what you are saying, but I think you may be making false assumptions.
I couldn't possibly have had both feet more in when H and I got married. Yet I did seriously consider keeping my name, for much the same reasons your W did.
What if your W agreed to change her name, but was then resentful the way you apparently have been all this time? I don't see how this helps the M.
I am not familiar with the finality concept, but I would be willing to bet that most of us here were pretty sure that the wedding vows sealed the deal . . . .
me: 44 XH: 42 M 11 years D10 and S8 Bomb drop 9/27/13 D final 7/1/14