Mixture set max rich for takeoff is primarily for engine cooling. Max rich is not needed for other phases of flight. See images borrowed from American Bonanza Society.
In our 1967 M-20 we got rid of the shower-of-sparks system (starter vibrator) and installed the SureFly on the left side. Also, we changed the starter switch to Electroair EA-13000 vertical https://www.aircraftspruce.com/catalog/elpages/ea-ignswchpanel.php
Note: placard in image above panel clock saying RIGHT mag must be OFF for starting.
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