There is no sane way to update Oz for recent macOS versions. The current ways with the external kernel support already is batshit crazy. Also, no, Oz is not easier than OC. It might appear to be easier on the platforms it supported well, while on some others it will simply not work at all. All auto-detect configuration done by Oz - and still done by Clover - are heuristics that work ok most of the time but every now and then fail phenomenally.
Why don’t you spend your time making OC easier to use as you see fit rather than trying to revive is zombie?
Did you know that Ozmosis Catalina can also boot without an external kernel patcher?
I'm not such a good developer to e.g. Modify OpenCore so that it can be loaded from the BIOS