Are you thinking former coaches/pros etc see what they think the style and approach that will be needed to win and then hire a DOF who is on board with that vision?
Well, to be honest...I don't know.
And as you say, that part is extremely important, not to say the most important one: you can't just let a bunch of random clowns sit on that "football board" and let them a) devise a plan and b) hire a DOF.
One thing which can be mentioned here is that making "football people" with experience and a connection to Manchester United members (directors, whatever) of a board should be far less risky than employing them as either DOFs or managers. For one thing, it's a board, as in multiple people.
As I see it, this "football board" would be
initially tasked "simply" (it wouldn't be simple at all, of course) with devising an overall plan for United over the next few seasons: given where we are now, what is a realistic target for the next season, the season after that...and so forth. What sort of players should we go for with these targets in mind? What sort of football should the "brand" of Manchester United be associated with? (Which again would influence what sort of players we go for). What sort of overall "club culture" should we aim for (again: this should absolutely influence transfer policy). And so forth.
As for individuals, I'd perhaps go for a mix of pure experience and...something else: fresh perspectives. A mix of people associated with the Fergie era
culture, which was a
winner's culture first and foremost, and people who bring something else to the table (someone with experience from working in a completely different culture, one where the "manager" was not king...which Fergie himself very much
was).
Just one example (and I'm not saying he should be approached for anything like this, it's just an example): I never wanted Ole to get the manager gig permanently. But I wouldn't mind him on such a board.
And bear in mind here: devising a strategy and then, subsequently, holding DOFs and "managers" (head coaches, whatever) responsible for carrying out that strategy is vastly different from actually doing the job on the floor. It's "easier" in one sense, it's about maintaining standards from above, not accepting anything below standard from the people below you, keeping them honest. I actually believe we have some ex-players and other figures who'd be suited for that job even if they arent' suited for actual coaching or direct management (which is, again, a completely different ballgame). Perhaps this "football board" could consist of such people - and others with no particular ties to the club/the Fergie era (and/or others again who could be a bit of both).
I'm just throwing out ideas, obviously.
ETA And I would stress that the role of this "football board" should not be to constantly meddle with the affairs of the DOF and/or the "manager". Their role is to make sure the ones below them don't get away with not delivering on the targets set. The "football board" would be - let's say - guardians of the culture, the overall ambitions, the "philosophy" of the club.
Simplistically (very):
If the "manager" doesn't deliver, the DOF has the power to sack the fecker.
If the DOF doesn't deliver (he can't keep hiring "managers" forever), the "football board" has the power to sack
him.
Of course, none of this is even remotely possible in practice if the owner is an utter idiot (or someone who doesn't really care about the football side).