Right on point. I have done a lot of React Native but never tried to mix native + React Native (with the exception of the occasional native feature in a mostly

Right on point. I have done a lot of React Native but never tried to mix native + React Native (with the exception of the occasional native feature in a mostly RN project). Mixing an old native project with RN, doing a so called "slow transition" sounds like a really bad idea. Data communication between the native part and React Native will become an issue, you're effectively going to be running a mini distributed system within your device. There's probably 100 other problems that I can't even start to imagine. Perhaps a super experienced, world class expert in both JS and mobile development + runtimes can pull it off but I wouldn't be comfortable trying to do it (been doing mobile development directly since 2016 and have been close to mobile dev since ~2011). Re-write is a better option.