This was always an issue in Rome. People were afraid their heirs would turn out to secretly be wannabe dictators, and you couldn’t do anything about it since you were dead. How would you go about making sure your heir was as close to your vision as possible, both outwardly and in their desires should they be emperor?
clone yourself, always keep a kid, adult and old geezer clone at the same time
infuse your memory on them ofc
the adult they/you decides. the young and old are helping with decisions or replacement if you have an accident
that seems to be a solid foundation for a lasting empire. nobody can possibly predict this to go wrong in any way.