The main thing I dislike about point 4 on the VZ58 is that the sling presses into my lower chin when trying to get a sight picture...
I actually forgot about the loop in the stock. so long as you don't want to fold your stock, you could do what the israelis do and tie a paracord loop (just a simple large loop connected by a double overhand), put the loop through that hole, and then pull the other end through the loop going through. And then just tie your sling into that loop.
Depending on how sharp that piece of metal is, you might want to paracord wrap it first to help protect your sling paracord loop.
I might play around with the qd and that point setup actually. There's a lot to like except w/ the stock folded...
From 1:45 on with muzzle down in front is the rhodesian carry version. Stock to primary shoulder when hanging and when you throw it behind your side/back for transition to sidearm it doesn't block access to your pistol. And if you just want to carry it behind you, the muzzle is up and out of dirt. Reach behind with support hand and grab stock and pull it around to deploy, or if not time or a need arises for a weapon before you have it fully pulled around, you can still reach for sidearm unimpeded. Sling under primary shoulder has none of these benefits.
And the only thing you can do w/ 3 point that you can't do w/ 2 is carry your rifle like a backpack... Otherwise, it's just more material along the side of your weapon to get caught up or block things it shouldn't.
Lastly, the Israeli around neck carry makes your two point sling effectively a one point...