Mine sound a lot like yours, Fyrebloom. At 32 weeks now, A hasn't shown up vertex on weekly U/S since 25 weeks. A sits with his butt on my cervix, head sort of off to side. And B manages to go from mostly transverse to mostly vertex, but that doesn't do us much good when A continues to sit on my cervix (and kick the heck out of my bladder). They have plenty of fluid, but since they haven't moved a whole lot for the last 7 weeks, my doc thinks it seems increasingly unlikely. And I can't try a lot of contortions to change things since I'm on strict bedrest. I really don't want a C-section, but looks like that may be in the cards. But since I've also had preterm labor, what I want to avoid even more than a c-section is early babies (still, the c-section recovery scares me, as does taking care of newborn twins while recovering, not to mention the lack of involvement in the birth and the less than ideal birth circumstances).
May we be pleasantly surprised by our baby A's turning vertex!