Check into converting to propane. I would research on some sailing forums to see what others have to convert to propane. Because that is the only way I see it. I think you only have to change orifice because one runs so much hotter than other, forget which one is hotter. But I understand getting the orifice is hard sometimes.
The only reason I know that much is because of a conversation with the dryer folks back when we thinking about changing the house natural gas to propane and he told me of the sailing crowd.
Here is one but very old...
http://www.sailnet.com/forums/gear-maintenance/11656-butane-propane-conversion.html