I have mirena and estring and use oestrogel, over active bladder was unbearable prior to any treatment, estriole vaginal cream helped, but I had a light post meno bleed after five months of using.
That resulted in hysteroscopy, estring, and oestrogel, and I do feel things have improved a lot, I still can go from not needing to pee, to desperately needing to, but generally my bladder is better behaved than it was.
Re having mire than one gadget up there! I really don't feel it, and after two weeks of trying without estring, I found soreness during sex returned, so seems it most definitely helps.