There's a guy called "wonitor" who work on miui 8 for galaxy note 4 and note 3 he almost fixed all the patchrom bug
The problem is that he only speak Chinese but maybe you can see how these fix are done
He make patch for updating ROM
I'll can send you link if you want but have no idea how these patch work maybe you'll can
(Also note 3 is a bit similar in hardware as one m8)
Anyway thanks for your work
It would be really great to at least get it somewhat working. I love MIUI and with it based on Gpe it's the perfect match. JHope you can do a few things. This is the only rom I'm wanting to return to.