Better look elsewhere then, iseikai has been all the rage for like the last 15-20 some years now? Not sure what else hasn't been done yet, but every the trope(s) have been well-established at this point AFAIK. I'm feeling old...

Now the question is whether or not prince Rox here is another reincarnated fella...
But if Prince Rox really is one, he is an absolutely retard in politics and not respecting authorities.
- Humiliating a Duke by demanding his daughter as a concubine/2nd consort after being notified ahead NOT TO?
- Told everyone else to F off in the face of disaster... right after announcing he could/would be leading them on a major development project/expedition?
- I think Marianlotte is about to develop a serious crush on Mark Stuart.
Quite a foreshadowing from the last chapter with Vamiliora not showing up; she may also be reincarnator who didn't want to die by Mark Stuart's hand (from chapter 1, her sister spoke of revenge)... And if she is one and she knows the current Mark Stuart is another reincarnator... well I suppose I can keep reading to find out.