How about just simply using John Deer Starter Fluid and 25 wt mineral oil mixed 70/30 in a small jar marked with the required volume of each component then fill tank and fly. JD is 80% ether and the mineral oil will keep it from detonation. This is basically the old Drone Diesel fuel mix. The ether has a very wide fuel/air ratio like 8 -10 to 1. This works well in fixed compression diesel also. You can test other starter fluids to see what ones work (some have very low ether like 10%, price usually gives a good indication of how much ether is in the mix), work on a test stand to get the right compression and needle setting. One thing that may happen with a more current diesel with this fuel is reverse needle reaction. The old Drone did this all the time, as the engine warms after starting you needed to OPEN the needle to smooth out the run. This is kinda opposite of kero fuels where you lean the mixture to smooth the run while backing off the compression.
Best, DennisT