I think what they did with living monolith in lost omens is a reasonable way to give a class more focus points for a specific type of ability. Basically players are locked at 3 but the monoliths abilities aren’t tied to focus points (even though they are just casting spells like enlarge person, stonetell, etc) but actually tied to number of class feats taken in the archetype. So a living monolith can cast them up to 7/day.
I’d consider for Paladins as a house rule for lay on hands to have every feat you take that effects lay on hands to give something similar, thus giving an alternate pool akin to clerics just to cast lay on hands. I could see doing something similar for some monk abilities.. I wouldn’t do it for anything that’s just scaling damage, but more basic stuff that’s fine.