Just rec’d an email from the Porsche BMW Owners Club. They run a bunch of races in FL and occasionally come to Barber and Roebling. According to the email you can race NASA SpecE30 or BMWCCA SpecE30, which I interpret to be a matter of tires.
Jim Levie has raced with them, probably some of the other FL types also. I’ve talked to them a bit but never made an event.
IIRC you can get a PBOC comp license, with your NASA license as a basis, for $50.