My insurer adds a risk rate for alcohol and propane stoves. CNG is their preferred fuel. When we had a boat with alcohol they were on the fence about extending coverage until we signed a non use addendum. According to underwriting, their concern is 2 fold. The nearly invisible flame and the possible spill/spread danger.
Since the insurer does not know the difference between pressurized and non pressurized alcohol stoves, and does not understand that the Origo (and some few competitors) do not use remote tanks and hoses and no pressure, and does not understand how the Origo burners are filled, you really do need a different insurer.
After all, if they "prefer" propane with it's rare but tragic explosion result, they have their priorities inverted.
Even CNG is quite dangerous with improper handling. And then, how many boat owners have their CNG or LPG hoses replaced on any regular schedule? I have read that in the UK, a certified professional is required to this every 5 or 7 years, I forget which.
(To me that would be quite an expense, and reminiscent of the cost of owning a small plane where almost all work has to be done or signed off by a licensed A&P person.)