Additionally, what’s involved in writing a different ORM integration or just some queries from the PlanResources api?

The output of the

PlanResources

API is documented at https://docs.cerbos.dev/cerbos/latest/api/index.html#resources-query-plan. There are example integrations for Prisma and SQLAlchemy at https://github.com/cerbos/query-plan-adapters that you can use for inspiration as well.