Perhaps a micro switch in the throttle linkage or one activated by a vacuum dashpot and you could set it to trip a relay and only run when the engine is at light throttle or high intake vacuum. A simple mechanical adjustment could set the threshold. One problem with trying to charge a fairly discharged battery with the alternator is that the windings can get very hot reducing it's service life.
Personally it sounds like a lot of work for little benefit.
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