You do realize that as the distance between the barrel centerline and the sight centerline increases, the degree of difficulty increases for trying to hit a target at a distance that you didn't zero the sight/optic for. IMO, it is easier to practice and learn how to use your regular optic. Been there, done that....just trying to save you time, money, and frustration. If you want it because it looks cool, so be it.
JTJ's suggestion is a good one if you want that second sight that badly.