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I'm probably stepping off the deep end of my limited pool of knowledge, but you could run a hotter coil.


But that is pretty much the same thing isn't it? The motor is still rich



Right you are. A higher voltage coil, when set up with the correct plugs, wires and gapping will produce a hotter, shorter duration spark.
Remember, a coil builds voltage until there is enough to overcome the resistance in the ignition system. That's why high energy ignitions use resister wires and wider plug gapping (or higher resistance plugs). As soon as it has enough voltage to do this, you have spark. So a coil that is capable of producing, say... 40,000 volts in a system that requires only 10,000 to overcome system resistance will produce 10,000 volts.
This is actually better in lean burning systems that have a high degree of vaporization so that the air/fuel mixture is evenly dispersed.
In systems that run really rich such as nitro-methane dragsters that have big drops of fuel unevenly dispersed in the combustion chambers, long, slow, cooler sparks are desired, hence the use of magnetos in those systems.

Contra todo mal, mezcal; contra todo bien, también