Hi WJ
What is your income now? If you owe just €100k, then you would probably need a salary of around €40k. ( I am out of touch with salary multiples, but I think it could be as low as this).
In three of the cases in the link, UB was the lender which allowed people to keep their tracker mortgage.
Since you were first refused, they have become the only bank to allow customers to transfer their tracker to a new home.
As you have been paying the mortgage on your own since the separation, without going into arrears(?), I think you have a good chance.