For the Mystic of Athas UA 33 quite does the job if you exclude hexblade and Wu Jen. You get left with three psionic subclasses which suplement 2e take o npsionic quite well.
I to see Templars rather as warlocks, their spells are better suited than cleric spells and a sorcerer king is a defiler / mystic undergone a metamorphosis, but still a living being not a god. If a sorcerer king would be a god then Templars would not loose their spells if his physical form dies like with Kalak.
Since Templars are NPCs in my point of view it does not matter that much, give them any divine spell you need, but mechanically run them as warlocks rather.