I've found an instance of an ad-hoc wrapper rule, which you register in the RuleRunner:

@rule
    async def run_rule(
        request: UniqueICsRequest, python_setup: PythonSetup
    ) -> InterpreterConstraints:
        ...

This works well enough, but is some extra boilerplate. Thoughts/opinions on constructing this automatically? so you could do something like:

RuleRunner(
    rules=[
        ...
        CallableRuleHelper(_my_rule_helper),
    ],
    ...
)

To me, it feels similar to adding a QueryRule. An alternative I could see would be to make a parallel to

RuleRunner.request

that executes rule_helpers

Having a helper which makes it callable like a normal rule doesn't sound bad to me 😄