Maybe this technique will work great to remove grain and enhance detail in shots that don’t have too much motion?
Why would we want to remove grain? The UHD is already overly grain “managed”.
When you mix 4K77 (heavy grain) and the UHD (little/frozen grain), something’s gotta give or they won’t blend seamlessly. A mixture of degraining and fake grain is pretty much inevitable at some level.
Exactly, when you’re combining (what is effectively) a first-gen camera negative (UHD) with a 4th gen release print (4K77). You need to compromise.