Renaming the backported libs would defeat the purpose of being ready for v5. But the v5 libraries generally already have different names than the v4 libraries (singular instead of plural).
Sure, that is my fallback option, which I guess I will have to do. It just means I have to wade through the v4 libraries in CvPCB and pick out the v5 libraries. Inconvenient, but not a show-stopper.