Can holy have blessed hammer added in as a rotational filler? It would be easy to implement, just make it do a little damage, block a little damage on enemies it hits like smite for disc, maybe give it a small heal if it hits a friendly player and have it generate holy power.
It fits the theme for caster and melee since it originates from the player but still maintains functionality since you can cast it without an enemy targeted. As long as it has some type of healing component and generates holy power, it’s a win-win for the class thematically and rotationally.