The biggest reason you don't see more TWF is the PAM feat. You get the bonus attack, that you can use GWM with, and your ability modifier with just 1 feat. Plus you get the added benefit of GWF style.
I'd say just let dual wielders have their ability modifier on both attacks and call it day.
I call it night, since this would overshadow twohanders at early levels. If you want your ability modifier added to your off-hand, dip 2 levels into fighter or ranger to get the proper fighting style. Preferably fighter, since you earn Action Surge on top.
A fighter/paladin would hereby earn two fighting styles, preferably twf and defense. The Dual Wielder feat grants access to d8 weaponry on top of another +1 AC and the ability to draw both weapons the same turn. Dipping another lvl into fighter introduces the Battlemaster, and since I am talking about a paladin - hopefully with a good charisma score - Rally could be put to good use, though Riposte, Precision Strike, Menacing Attack, or whatever might be more appealing.
Along with Hunter's Mark (Oath of Vengeance), Divine Smite, Improved Divine Smite, and maybe superiority dice combined with the Vow of Emnity this can get as serious as a GWF combatant even at higher lvls IMHO.
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