Would it be possible to embed Bitrig in an existing app? Similar to how you might embed React Native into a portion of your app to accelerate development in a specific area, it’d be awesome to preserve the mature areas of our apps and use Bitrig to quickly iterate on new features.

Yes, we think that could be a really cool way to allow mocking up changes to parts of an app, especially for non-technical members of the team. We're not set up for that yet, but it's on our roadmap.