Would `someForceBuildAPI(pathToProjectRoot)` or `someForceBuildAPI(pathToProjectConfig)` satisfy this?  Or do you want to be able to force a build without even a checkout of the project?  If so then maybe more like `forceTwistedBuild()` with an implementation that embeds the Twisted build configuration (but maybe I like the 2nd API suggestion more: it's easier to update an external project config file than some config embedded in a Python source file).