Well, there's always doing a CDI ignition conversion as an option. You use a 1/4-32 spark plug and CDI ignition unit. The aircraft guys do it all the time. Whether the plug cap will fit a car heatsink head is the question.

The guys that do the conversion often note the engine makes more power and uses less fuel because the ignition is controlled by the ignition unit rather than controlling the ignition point with glow plug heat range and oil content of the fuel. You could probably get away with less oil in the fuel too.