Seems to me you have a few options:
- Cut your losses. Part out the boat/motor/trailer and maybe even come out ahead.
- Undertake a proper repair. If you are not especially familiar with fibreglass structures or working with 'glass and resins, you will need to get some pro advice or do the research.
I'd say one option that you don't have is to just cobble it up and sail it without doing a proper repair. Inadvisable, in my view.
I know what I'd do. Life is short.