Is there a way to get Dex-to-damage other than Rogue 3? Like the grace feats? I don’t suppose the Swashbuckler-flavored Paladin archetype is available...?
Agile trait on magical weapons will do that trick. But you might sacrifice other traits you also would like.
List of feats that is not comprehensive as of yet: https://pathfinderkingmaker.wikia.com/wiki/Feat