Hello again,
So i managed to do this solo (why wait for someone else

)
All it took was to install Python, and then use a ready script (payload dumper) to extract all img files from the OTA payload.bin.
Then the supreme took that is magisk did the rest and I have a patched boot.img which i flashed and root is up.
Do you want the patched image? to share with others here if anyone needs it? too big to just upload here.
I'd be happy to assist in such matter, while i'm not a developer i do know my way around.