Well my friend, let me tell one thing first: you are EVERYWHERE! I recognize your profile pic at this point xD
Returning to the point. For me it was really easy and I understand your fear of say goodbye to Vanced.
The revanced EXTENDED has a different appid from youtube, vanced and revanced, so the good news is that you can install it and try it without the need of uninstalling anything! I got mine by installing first the apk "manager" here (just scroll down and skip the first download link).
When you open the manager you will have a list of thing to install:
just install the Extended version and remember to install/update microG (always by the manager) if you use your Google account