Thanks very much for the reply, @rockiger.
https://medium.com/swlh/wordpress-create-react-app-integration-30b41657b79e looks very interesting. That seems like a good start for what I want to do. It doesn’t cover making react-router work, so it’s not a full replacement for the functionality that I get with ReactPress, but it’s a good start. I think I can probably figure out the routing stuff with a bit of work.
Sorry but my app isn’t really worth sharing at this point. I’m just playing around with dummy code to see what’s possible. The project I’m working on is building data dashboards in React and we’d like to make them usable in WordPress sites, but we’re pretty early in the project. I am just exploring feasibility.
Thanks again for the reply and helpful pointer!
-Michael