Welcome to Epic. You might try posting this over on the Boot Fitters Forum. Personally (also have a wide forefoot), I've never found any boot from any maker that even vaguely resembles the human foot, let alone one that's wide in front. According to fitter in VT I know, Euro rep for boot company told him that Americans have fat feet, and Euro makers can't be bothered to change their lasts; we should go on a diet. What that's got to do with skeletal dimensions is unclear, but that mentality is what you're working against.
This year tried on several brands, Head Raptors supposedly have a "square" toe box for extra room, found no such extra room even though it looks mildly squared off on the outside. Salomons, which used to have a wider front and narrower rear, have gained a lot of volume overall and won't work if your ankle isn't thick. Some of the 100 mm Langes aren't bad, so that'd be a place to begin. I have Dalbellos, which are better this year for metatarsal width, but still take some work if you're wide. No doubt someone here will suggest Fischer Vacuums, which are supposed to be the solution for problem feet.
The solution for any foot, of course, is for boot makers to take an cat scan of some feet and then compare it to their lasts and molds. But that would be too obvious. Better to design boots to resemble street shoes with fronts that are symmetrically narrowed.