I've skimmed across your implementation doc and especially your template repo, and I wonder whether some simple unit tests (included in the template) would not be a good idea?
Maybe also directly include a GitHub Action to run these tests in a CI.

As such, IMHO; this would make developing a new provider even easier by having a verification whether everything works (somewhat, at least) and support proper development practices.
This could make it easier to test the providers.