Time to get past the "true" synthetic wife's tale.
If precursors to PAO come from refinery byproducts of crude, and group III also come from refinery byproducts of crude, is there a value proposition really to be had? Particularly if good Grp III base stocks perform within 95%+ of a PAO, at a much more attractive price point? There are high percentage PAO lubes out there, most of which you'll pay an arm and a leg for (though M1 EP 0w-20 is an example of one that can be had from Wal-Mart for $8.xx), so if you want to pay >$10 for some boutique lube the benefits of which you'll never take advantage of, be our guest...
Or learn that value proposition is much more "valuable" in the performance of a finished product, and get over a decade old wife's tale.
What is so exotic about a red block in FL that drives the necessity of PAO and ester???
What's your technical basis that the M1 0w-40, which is sufficient to protect high end modern Euro vehicles that make WAY more power than vintage cars did, is insufficient? Have you tried a simple experiment, like running a 20w-50 to validate that the higher viscosity will solve your issues?