You can now install the Samsung Galaxy Note 5 ROM on the Galaxy S6
Samsung Note 8 Android 12 - YouTube
This is Noble rom, an android 12 custom rom for the Galaxy Note 9 and S9 by AlexisXDA on XDA. It has some bugs but nothing that's deal breaker, some stuff have
Galaxy Note 8 SUPERCHARGED w/ S9 ROM Conversion! | HighOnAndroid.com