Matt, a few Model T guys with electronics backgrounds have developed a new electronic voltage regulator for the Model T/Model A. If you haven't already checked with them they might have something that would work with your car. The guy actually making them is a Porsche/Model T guy (rare combination) in California.
https://modeltstarters.com/voltage-regulators-cutouts/
https://modeltstarters.com/contact/
https://www.mtfca.com/phpBB3/viewtopic.php?t=38035