One thing you can try with a shingle roof is wetting it down with a hose during the fire event. Particularly try and force water up under the shingles. Good luck since you may well not have sufficient water pressure in your water main due to other demands.

I bought a house here in SoCal that had a wood shingle roof. The first major project I undertook was to replace it with asphalt shingles. They are not fireproof by any means, but they are way better than wood shingles. Oddly enough, it did not change my insurance rate. A tin roof would have made a difference.