Yes. You are correct in all. Thanks!
“Do those kaya sankhara trigger kaya vinnati rupa?” Yes.
I have revised the post in incorporate those: “Kamma are Done with Sankhāra – Types of Sankhāra“.
“Mano sankhara alone are not abhisankhara, right? Mano sankhara can lead to abhisankhara via “more thinking” in form of vaci and kaya sankhara. Thus the kamma is not strong or complete with only mano sankhara. Mano sankhara are the initial reaction (sanna, vedana) on a sense input (also to a kamma nimitta in case of cuti-patisandhi). “More thinking” means more cetasika are involved, like dosa, moha, lobha …”
Yes. Correct! Mano sankhara cannot lead to rebirths. But both vaci and kaya (abhi)sankhara can.