It appears that the OP is looking for a fork that accepts 50mm+ tire in a 1.125 straight or 1.250 tapered that night be the a solution to his question. Since the Whiskey MCX won't work, what else it out there. A lot of other carbon forks that accept a wide tire are generally 1.5" tapered

Of course the other piece is A2C and rake. From what I found the Focus Mares has a 400 A2C and 45mm offset.

John