I just did two test runs with Russia. NFs in both to clergy in Moscow, Kursk and (after ideology) Kazan. Education on 100%. Russia starts with 1% clergy.
First run: As I usually start, taxes high on middle class, as close to zero as possible on poor and rich. Immediately seed a handful of factories in the most populous provinces to get the capitalists going. Result in January 1946: Overally clergy 1.21%. Moscow 1.7, Kursk 1.6, Kazan 1.2. GP rank #2.
Second run: No taxes on poor, 100% on middle and rich. No factory seeding. Result in January 1946: Overally clergy 1.28%. Moscow 1.8, Kursk 1.9, Kazan 1.5. GP rank #5.
Doesn't look like much, but I think 28% vs 21% increase over ten years makes quite a difference. As industry doesn't seem to serve any practipal purpose in the first decades, it should be a viable starting option for countries that don't have to worry about GP status (either because they're safely in like Russia, or because it's out of reach anyway).