yes paladin class did strike my mind but most of the common skills are not doable afaik (combat resurrect, magic shields, there are no undead (and few demons to make something holy worth it) auras are already in game)
also i was thinking of real dualclasses (nothing fancy, just a couple of skills for all those stupid multipath champions) so paladin could be mage +warrior dunno
as for restrict i made something similar
i gave armor proficiencies to classes 
so instead of being unable to use other stuff they are just much better off using their appropriate one (defender +1 def for each plate piece, assa +1 dodge for each leather etc)
the problem is the usual, unless ai gets improved with specific (and moddable) guidelines all the content we add is raped by the inability of ai to use it 
but since ai cant use properly anything vanilla at least i have more fun playing 