Is there any non-item way to use strength instead of dexterity for to hit with thrown weapons?
I already know about the belt of mighty hurling.
Looking for a feat or class based solution, third party is ok.
It's better to use dex anyways if you're going to make your build around thrown weapons. You need many of the typical archery feats (Point-blank Shot, Precise Shot, Deadly Aim, etc) to be competent at it and they have increasing dex requirements as you go.
If you can't pick up those feats, you're going to really struggle.
This is why the best way to do thrown weapons if to be a fighter with the new advanced weapon training that gives you double your weapon training bonus to damage with thrown weapons (Trained Throw).