Keep the ovaries, or at least one of them. There is no need to forfeit them just because the womb is coming out. If just one ovary is saved then you do not need HRT.
The removal of the womb will solve the adeno and will get rid of the residual placenta problem too.
As you have a recent C-section anyway, I would imagine they will go back in the same way.
Depending on where the placenta was attached - they ought to be able to leave your cervix and vagina intact, just taking out the uterus.
I have a deformed womb set up- had the big op, they took out one ovary, one tube and part of the deformed uterus - leaving part of it for a mirena coil.
So my situation is a bit different to yours because having a baby or rather carrying a pregnancy was never possible, but having lost half me bits- i don't feel any less feminine- just being relieved of pain on that side , and now not having periods because of the mirena I have never felt so well in decades. I don't miss the missing parts one little bit. Good riddance is what I say.
Liberated that I don't have periods and don't hve any more angry ovarian cysts on one side.
I still have probs with the remaining ovary which has a cyst grown since the big op, but boy am I much better able to cope these days.
Recovery from the op is not quick - took me 4 months to be able to lift a toddler and not be in pain doing so, and my tummy muscles were weak for a lot longer, but they're fine now, back to full strength again.
It is a lot to contemplate when you have a new baby to look after too, but looking at the long term picture- hard as it will be now, you will feel a whole heap better able to cope with an ever demanding toddler without having periods and the adeno disrupting life.
In your shoes, having got through a big op - it is worth it..in the end, even though there will be times when you are so sore and miserable and wondering why on earth you put yourself through this, it won't alwys be like that. Very best of Luck.