Facility Association is the insurer of last resort. As for affordable, I am uncertain.
If he is high-risk, the odds are he is being quoted facility already. That price should be independent of the broker you use (assuming they all enter the same data).
Unfortunately OP, as has been stated before, you are high-risk, to reduce your premiums, you can ride a smaller bike, or not insure your bike until some of the tickets have dropped, it's not complicated.