This is not a thing. The strong progestin in the combined pill stops your uterine lining building up, and women who have been on the pill long term generally have a thin, atrophic lining.
However if you are stopping the pill and continuing with the estradiol patch, you do need to take a progestogen alongside this going forward to control your lining, however provera would not be most people's first choice due to less favourable cardiometabolic effects vs the more modern progestins or micronised progesterone.
Taking combined birth control at the same time as HRT is also likely to have contributed to the raised SHBG, so I would definitely recommend picking one or the other, not both.
However a raised SHBG in itself is a normal response to taking birth control and is not pathological nor needs to be managed, although it can reduce free testosterone which can result in reduced libido and mental health effects.
On the other hand this effect is deliberately sought in women with acne or PCOS who are seeking to reduce their free testosterone, which is why they often prefer pills with an antiandrogenic progestin such as Yasmin.
