Micronised progesterone is reputed to not be as effective as synthetic progestins at stopping the uterine lining from building, but I don't think there's a lot of research to back any opinion on it, either can be used. With endo the "stronger" synthetic option is normally used, it certainly has more side effects!
It's the negative side effects of progesterone/progestins that causes the problems, while apparently the positive effects of oestrogen help symptoms but also can cause an unhealthy build up in the uterus.
All the rest is to find a balance between the two and if your own progesterone is still enough, taking more can cause an excess with flu like side effects.
If your own oestrogen was working properly you'd not be getting symptoms, so I agree you need HRT for your bones.
I was also worried about my bones, I've been underweight most of my life, so when my GP turned out to be completely ignorant of HRT I was put on the gynae waiting list, back in June 2023. While I wait for my gynae appointment I take tibolone. The GP said they couldn't give me oestrogel and utrogestan like others my age get, because women can't be trusted to take both properly, it's their decision. Isn't that appalling? I wrote to the practice manager, but nothing changed. I guess it's like your GP getting scared after one patient on the pill gets a stroke, they aren't always scientific or logical about it. So I read up on tibolone and it's actually a very good option for bone health, possibly better than oestrogen and I don't need to take any progestins at all.
I was bleeding every month until November 2024, then my monthly bleed just stopped, a couple of weeks before I turned 55!
The age ranges they use are a bit too tight as well, only capturing 80% of women, so don't be afraid to call it menopause just because you're younger.