Dave,
Where are you located?

I would absolutely fix that mast. The repair technique Wouter described sounds like it will work. Create an insert out of 1 or 2mil ply - run it beyond the break on either side, stair step an extra ply up near the middle of the break. Dont overdo the strength of the repair, you dont want to create a hard spot in the mast.

The only part of his advise I dont agree with is horizontal loops of carbon uni. This really doesnt do much to reinforce the mast along the length of the mast, it would keep the wingmast section in its section and not allow it to deform, but I'm not sure that adds much to the mast, and thats not how it broke, it broke pretty cleanly in the horizontal plane, so you need to run reinforcements vertically.

I'd sand off the eglass or half the eglass and add a layer of 5.7 oz uni, with the strands run vertically. You might want to add one layer of weave overlapping the repair. If you do add a layer of carbon weave over the repair go with some light weight fabric here, like 100g/in2. The only issue you create is that that part of the mast is going to be stiffer than the rest of the mast and might cause issues in other sections.