When you quoted some "multifuel" ability the first thing that came thru my mind were the hot-bulb engines used in older tractors (more known in Italy as "testa calda", or literally "hot head"), stationary applications and boats. They can burn anything from gaseous fuels to heavy oils, but the requirement for a kerosene-fired lamp to pre-heat the cylinder heads may be a problem for a practical use in an automobile. Why not to try a similar approach using glowplugs instead of the lamp, like it's done in some engines for model airplanes?
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