This reminds me of Where Recursive Justification Hits Bottom, where Eliezer explains that an agent that uses Occamian priors and Bayes' rule, when evaluating whether this is effective, would assign an Occamian prior to the theory that it is effective and update using Bayes' rule to account for its success and failures.

If you learn and adopt a mode of epistemology at one school, that is what you will use to evaluate a competing mode advocated by another school.