AB comp will work with Exact Mapping, and you can warp each map type within the map window mix. Exact Mapping will do exactly what you're asking I believe, except the curved screen warping (i.e. with beziers)
Awesome, getting into Exact mapping as we speak.
For this project we needed the full warping of curved because the two projectors are not always projecting (a) together or (b) from the front.