Is it possible to convert a non-embedded app to an embedded app?
Should I just enable the EAS in the app settings, make the necessary code changes, and then I am good to go?
The reason I ask instead of just trying, is that I remember I read somewhere that it would break the existing app if you enable the EAS.
As it states in the tip near the top of our documentation page for the EASDK, if you haven't made the necessary code changes before changing the setting in your partner dashboard your app will certainly run into issues. If you've already made the necessary code changes and ensured your app has an SSL certificate to avoid mixed content errors due to it loading in an iframe, then you should be good to flip the switch on your app without issues.