better yet use a section of the crushed one as a mould for a sleeve.

1. Cut a 2 foot "good section" of mast
2. cut it down the centre line.
3. Lay one half of the mast on a flat surface and laminate on some flanges.
4. Introduce the other half and make some matching flanges.
5. drill bolt holes though flanges.
6. cleanup and wax inside of "mould"
7. using a vac bag lay up sleeve in mould.
8. fix "clean broken mast" with sleeve
9. grind and tape over joint.
10. that was a much bigger job than you planned but the result will be better.