Nice, I love my model 40 as well. I’m curious in trying the above trick using the cotton and the various additives.
Do you value your health? I would be concerned about “spontaneous unscheduled disassembly”. Those guns probably are not engineered with a margin of safety to withstand the pressures of diesel-type internal combustion; they simply were not designed for that. It could be an interesting idea for a purpose-built gun though.