It sounds ok to adapt tools if needed (won’t get into whether tools are actually needed, let’s assume they are).
But Rails is supposed to be a giant, everything and the kitchen sink framework bringing everything from an ORM through its own console to scaffolding code generation.
If adding tools to the setup is needed, isn’t then rails the thing to reconsider? Something more modular could probably work better.
Just reading “vanilla Rails” sounds like a red flag. How can that behemoth be considered vanilla?