Why not just take it to a gunsmith and negotiate a decent price to avoid unnecessary damage to the slide?
If you lived near me I'd do it for you as a courtesy.
POA/POI issues can sometimes turn out to be other than suspected, though. I'm not saying that your case is, but thought I'd mention it.
I've seen any number of our folks who claimed to have 'elevation problems', and who brought me their pistols for 'repair', have pistols which shot just fine when I tried them. Sometimes I slipped dummy rounds into the magazines and made the shooters actually feel the anticipation of recoil and muzzle depression. I've found that most folks won't believe it unless they can experience it in a very obvious, albeit unexpected, manner ... without being distracted by actual recoil & muzzle blast.
Then again, it's not all that uncommon for S&W .45's to require some different front sight posts. Been there, done that. Adjustable rear sights can help, presuming the rear sight's adjustment allows for enough movement. I've used a couple of different adjustable rear sights on different S&W .45 pistols. At least one of them easily slipped into place with just finger pressure and it really needed the set screw. I prefer to have to fit the rear sight base, or at least have it tight enough to require a sight pusher. It's annoying when a rear sight base starts to slip and move.
Now, S&W sights are often pressed into place so tightly that it's rather amazing how much effort is required to break them free and start them moving. I once heard of someone who works at a well known gunsmithing service who reportedly described removing some S&W steel rear sights as sometimes being like having to hammer on them like the wrath of god. (One of their customers related that to me once.)
Even using a sight pusher can often require some effort to break a sight base free.
Obviously, heavily whacking night sights probably isn't the thing to do. Although I never damaged a set of night sights doing it the old fashioned way, which involved more 'fitting' than heavy-handed hammering, installing an increasing number of night sights is what finally made me spend the money on the sight pusher sold by the factory.
Well, that ... and the fact that I've become increasingly lazy when it comes to doing simple armorer maintenance and repairs.