The rub the suspension (ie: inside of the wheel), not the fender.
If you want a bigger wheel in the front, you have to go aftermarket and get the correct back spacing.
And there is no real reason to rotate. The whole purpose of rotating (for cars with the same wheels and tire sizes front and rear) is to get even wear on the fronts and rears, and thus replace the entire set at one time. There is no problem with replacing them in pairs as they need to be replaced.
Perm-a-grin in place.....