dlc/expansion idea: generals/great generals

ok i had this idea since day one, personally i like the combat, its more about preplanning the battle then the battle itself however a lot of the early game and sometimes the mid game, you just get a ton of units and just throw them at the opponents, ie the mycenians, the pretorian guards, hoplites, mongol horde, (but at least that one makes sense) jaguar warriors, etc.

the problem does fix itself coming to the early modern era and above.
what i was thinking though is, what if there were great generals whom has specific bonus like
+2 to melee units while defending
or
+1 to all full strength units
or maybe
+1 to cavalry and + 1 to all cavalry charges.
this could become a problem for balancing however i think it would be cool to see some lesser or more known great generals of the time and to see battles have more thought put into them.
my idea would be just like wonders, there are a limited number of them and can only be bought with influence.
when they spawned they would be 1 of 2 things
either a: be their own unit that has their own stats, art, name, etc
or 2 have the same template as your culture's special unit but give a bonus.
these generals won't die in combat but will be sent to the capital and forced to stay there for an indetermined amount of turns
another idea i had is they would also provide a stability bonus to cities granting a celebrate on any city they are in while increasing garrison bonuses and unit stability bonuses
the final idea is maybe only militarists and expansionists could grab these units either exclusively or at a reduced cost however this could cost further problems with balance, thank you for reading my idea, have a good day