I think Paladin getting more ‘white magic’ is a great idea, and really reinforces its identity as a more supportive tank.
That said, I do think giving it Raise would be more aesthetic than practical, if not simply from how readily available it is to healers/casters. I think it’d be better to give Paladin more unique spells like Clemency and Holy Spirit. Maybe a defensive spell that reduces damage taken to the target in some way like Stoneskin, or a ‘Shell’ type spell for magic defense (though obviously not strong enough to take magic defense away from being Dark Knight’s thing). Or maybe a single target Regen spell that reflects a portion of the healing to the caster (healing over time clemency).

Obviously all these suggestions would have mp costs / cast times / possible Oath costs for balancing