I don’t think it will be much more difficult than integrating it into the refactored version. For the most part the underlying logic is the same for the new and the old version, but how it is structured, variable names etc. is different. So problems will mostly arise if you want to do something like @Curiosichi, where you make all your changes to child blueprints and then update the underlying parent blueprints. Updating through copy-paste of new features should not be that much more difficult compared to earlier updates.