I noticed that Delos Insurance Solutions was advertising heavily on the thepinetree.net as a provider of insurance in wildfire/brush regions. Their ad contact information was http://www.getdelos.com/calaveras (415) 935-3244.
There is also FAIR Plan which is an insurer of last resort funded by every insurance company doing business in California–an insurance pool. Not sure if the property needs to be a primary residence or not. This is usually offered through independent insurance agents.
Just some ideas. Hope they pan out.