So I have done a great job (pats self on back) of marrying princesses in and among other factions right from turn #1 and keeping my king busy enough to have many stars.
This produced EXCELLENT heirs for the entire game for me. I didn't even have to bother marrying off my daughters after my first king died but the dynasty was rich with good heirs with nice virtues.

Keeping the above in mind, every so often the AI mixed in a crappy heir with not so great vices like strange who once achieving of age was put to the top of the heir list Can't let that happen
So instead of using my 5 star assassin I do as I usually do and send him all by himself to attack a 1-3 stack enemy somewhere

Often the first attack he won't die but he retreats. I simply send him in again and he usually dies a valiant death.
Well, last night I get a 7 star heir with a strange vice as next in line to be king and since I have an 8 star heir with good virtues already below him I send the strange one to his doom in Anatola vs. 3 stacks of crack Egyptain forces there.
SOB Same turn the Eqyptians send all but a few hundred junk troops into a neighboring province and my prince crushes the remaining defenders all by himself I get control of Anatola and I look at my prince. He now has both skilled risky attacker AND expert attacker

I decided ahhhhh.what the heck....Britain was famous for strange kings anyway and I let him ascend the throne.
I have a ton of money in the bank so his lower acuman and vice won't bring down the empire anyway.