Bowed Wall / Running Corners: Help Me Tackle Getting Studs in Plane
I'd be concerned about removing 3/4" from the studs on an exterior wall. I'd consider using 1/2" and 3/4" sheetrock or plywood to shim the sides as close as flat with the bow as possible, then use paneling, floor underlayment, or thin sheetrock over the whole wall to get a smooth surface for tiling. Since you're planning to open the wall anyway, another option could be to plane the existing sheetrock - not the studs - then sheet over it for a smooth surface.