Plenty of fuels available here in Cornwall. Lots of people are off grid.The problem with twin filters is, even if one is full of kero, the other is full of diesel, which can wax up in the filter. So you get it running on kero, when you turn over to the diesel, the engine dies cos the filter is waxed up. I think a fuel heater is the way forward.
I was shocked the other week, buying kerosene for the lamps, it's quite a bit dearer by the gallon than diesel ..Ā£8 for 4ltrs in the ironmonger! Nobody else sells it round here.