[p4] cvs2p4 - Creating uppercase branch names

[Weintraub, David]

Is there a way using cvs2p4 to mangle the names of branches? That is,
you have a branch "foo-bar" in CVS which becomes "BAR-FOO" in Perforce?
 
I'd like to make all branch names uppercase as specified in the book
Practical Perforce. I'd also like to clean up branch names making
something like Branch-1-4-3 to CELOX-1.4.3.
 
Would it be possible to take a checkpoint, modify the checkpoint file,
then rebuild the database? Or, would it be easier to modify the cvs2p4
programs to do just that?