The release notes for MultiCore haven't been fully updated but the version.txt file for it has a TBD list which includes a removeCore method.
Thus the same concept applies for removing commands, proxies, metiators or entire cores.
That will likely be done this week.
Any thoughts on the sort of alterations will be required of the existing AppSkeleton Demo? It'd be instructive to see comments in code from a before/after perspective.