You mean like Noctis' Armiger? That could work. The main drawback is that you probably wouldn't have unique skins for each weapon, just for the trinket itself.
I think there's definitely a spot for Mystic Knight/Rune Knight in the context of Ivalician lore, with the Covosi Unyielding Blade (which shares a name with Meliadoul's sword style). I think a Striking Melee DPS job based around Thunder God Cid would be incredibly popular, especially if it referenced all the classic Holy (Judgment Blade/Cleansing Strike/Northswain's Strike/Divine Ruination) and Darkness themed (Duskblade/Shadowblade) attacks. Crush Helm would be a great choice for a raid buff. I think if they released that alongside a Corvos expansion, I would probably swap to that instantly.
