A general mechanic idea i can’t put into rules language
Dedicate yourself to a deity (name a new one or choose one that’s already been established). You gain the commune and cast a spell cleric moves. When you select this move, treat yourself as a cleric of level 1 for using spells. Every time you gain a level thereafter, increase your effective cleric level by 1.
this is a perfectly fine move i think, however we could make it more different from the cleric.
Give the Paladin Spellcasting as a possible Boon option (after taking a move?). Whenever the Paladin fights for their deity (by smiting something/someone that is against the deity) they gain 1 divine hold and can spend this hold to just cast a spell from a limited list. The spelllist is depended on the kind of deity it is i think (some kind of domain system). They would have level 1-3 effects mostly to not step on THE divine spellcaster so much.
How do you like this?