Hi!
First of all, sorry for the lack of updates, I had a lot of work and finally had some time to continue trying to fix this Hackintosh.
I had to test a lot of options in order to make it work.
What I think worked (or at least feels like an upgrade) was to install the HD5xx patch with Multibeast, then, without rebooting, (manually) adding the minStolenPatch using PlistEdit Pro.
I did it wrong 3 times, as I've never done it before.
I'm not sure it's 100% correct, but it now boots, but still shows Intel HD 7000 but instead of 7MB, it now shows 1536MB.
It no longer does the glitch as it's turning on either, that's why I say it's an "upgrade".
I'm downloading Cinebench and Geekbench to test the performance.
I'm also going to test double monitors, as that is VERY important for me.
I read about double monitors when I upgraded the M700 Tiny to Sierra, as I tried different fixes for double monitor and eventually got it working, so I'm hopeful that I'll make it.
I'm uploading my EFI folder for if anyone wants to check it out.