I took another look at the few soft spots on the roof and decided that it was better to address without, full-on, fiber glass (ie strip along edges). I cut out a couple of spots and used some epoxy to put new bits in place.
I applied poured epoxy into some areas to smooth surface over and or to fill holes. In some cases the holes could not be filled with epoxy as the epoxy leaked through – in these cases I used epoxy putty. This will be an iterative process.
In the meantime I have been sourcing some new trim.