It's a no 'brainer really', practically these engines will run on all manner of liquid/gas fuels.... It is the BTU's per unit volume that will make the difference.(ie burning more/less fuel volume for the same energy output..)
Imagine changing nozzles etc to run on a cooking oil blend.....airports would smell like fish and chip shops!!!
Turbo fan/shaft/prop engines would suit this conversion fairly easily, its the certification that'll kill it!!
