@Britsimon Yes I think, I have done lot of research on it.
But let me just just brief you. My wife born in eligible country (ABC) but citizen of an ineligible country (XYZ). I am born in an ineligible country and also citizen of it (XYZ). Both of us are post graduates. I do have work experience as per listed professions and she had worked, but not in last 5 yrs. So for her -> education is the eligibility criteria. And for me both education & work experience is eligible criteria. And I can apply based on charge-ability rules. I hope I am on the right track......