I’ve released RPGReact, an RPG Maker MZ plugin that lets you build custom game UIs using React, while continuing to use RPG Maker for all gameplay logic and content.
RPGReact isn’t a UI skin or a duct-taped overlay. It integrates directly into the MZ runtime, mounting a React UI inside the same NW.js window and keeping it in sync with engine events as the game runs.
The itch.io page includes a playable demo game that uses RPGReact for its UI, along with screenshots and additional details.