You do have that option already, just need to play it.
No character is bound to a play style, as long as you manage to get the knowledge and find a way to sustain your living you can follow any path.
The only limit is switching body before the one you're usind die. As long as the old hero is alive you are bound to play it, you can retire and arange for your heir to take control, but with the risk that it's now a npc who's in control ( need confirmation, you are able to transfer titles to pc thru contracts, might not be able to do it with npc) But even without transfering title you can arrange for the NPC to run things.
and if the old hero does a good job at staying alive you might have to jump a generation and take over your grandchild.
I have no idea how deep you'll be able to "manage" your family; it seems you'll have a rather big control over your child till it reach 15 but after that when he becomes a full NPC can you still influence the way he'll run things ? and if yes to what extend ?