Ah crap.

If I search USB in PIC18F4550.PBPINC, I get this:

Name:  USB 18F.png
Views: 1342
Size:  32.3 KB


If I do the same search in PIC16F1454.PBPINC:

Name:  USB 16F.png
Views: 1364
Size:  41.9 KB


That messes up my plans as well for an inexpensive USB PIC.