@lfb6 - Thanks for all! 
Your welcome. Sounds to me like you figured it out, finally.
If you have prepared a ME region (state configured) this way it can be used for other machines, too, if never booted.
What I figured out is I won’t get any more specific guidance here, therefore I’ve abandoned modifying this BIOS for the fear that I’ll brick the damn thing. But again, thank you for your help so far!
Well, at least you wont get step by step guidance from me. There’s a detailed guide which you just would have to follow. I’m open for specific questions, but the basics are written quite often here.
So it’s your decision how important this project is for you- I’m perfectly fine with your decision. Good luck!