Maybe alternatively to the harem, which most likely would not succeed
, The Soviet-like, national PARADE could be the solution to the throne-room-succession problem.
Imagine adding some foxey lookin' cheerleaders in various uniforms for each epoch reached and.
Or having your Palace in the backgound, constantly evolving, and
adding your army's newest chariot, musketeers, tanks, ICBM etc. when reaching differet epochs ???
For example:
You discover feudalism, you get a mounted lord , wearing armour, in the lead.
You conquer another city --> you get rounded up P.O.W. 's marching in the middle of it.
You destroy another civ --> their leader carried in a bamboo cage, utterly humiliated by hoochie-spitting and tomato-throwing pedestrians...
Hneh...nhehhehehneehheee....