You’re welcome! Yes, @ket showed me this method, and it works best I think. You got it right, it moves the settings outside the suppress/gray if constraints, so nothing is contained within them we want enabled. You just have to make sure you remove same amount of bytes you insert when doing that
I used to edit by FF the entry value, similar to what you mentioned trying, like this >> Gray Out If {19 82} 0xF344 QuestionId: 0x9D equals value 0x1 {12 86 9D 00 FF 00}, which works, but not always and the other way I showed above is easier and a more clean method of doing it.
Suppress/Gray out If xx instructions can be any number of things, sometimes there is only true/false after that instead of questionID’s or other values.
And sometimes true/false (46 02 / 47 02) have different values in different BIOS (27 02 / 28 02). So any guide may not apply always to all BIOS, you have to get inventive sometimes 
Edits like these in IFR/hex can also be used to switch values, or switch default enabled/disabled settings or we can even hide things we want to disable too