Estate attorney wants 6 percent of the gross sale price to "oversee" my purchase of a probate SFR in Phoenix, on top of the PR's standard commission.

That fee is not normal. Statutory attorney fees in Arizona probate come out of the estate, not from the buyer's pocket on top of everything else. Every time I have seen a number like that floated at a buyer in Maricopa County, it evaporated the moment the buyer said no and walked toward the door.