I know how you feel about not wanting to use the same Sim, when I was still trying to get a decent start, if a Sim failed 2 times, I switched them for a new one. It just gets to the point where the old Sim started to remind me too much of past failures.
Consulations on your Dynasty failing, that's not cool, I'm sorry. But at least I'll still be reading the next one.
Good luck!