Firstly, the Glazers seem debt free; it's the club that have the bond debt that you equate to a mortgage. We have consistently bought quality players, have you not noticed the new faces turning up in the United team? What's this money going out the back door stuff you are inventing? Are you trying to suggest that something furtive or illegal is happening? Maybe you are referring to the Bonds being bought back. Well, that isn't really money leaving the building by any door. The club still own the bonds, they are still worth what the Club paid for them, give or take a little fluctuation, and they saved paying interest on those bonds. Smart move. Isn't that what you would expect any well run organisation to do; use the shareholders' money wisely? United spend around 50% of their turnover on player salaries and I'm pretty sure that no doors are involved and the players tend to moan out load if they have to wait for their salary.
Never mind a mortgage adviser, give all of your money to your wife and let her give you daily beer money. Then you won't have to think about it at all.