Head... that was masterful. Progeny then it's not ours, it's of the Vampire. We are only the dead host.
I considered lichdom, but they too brittle, also the smell...
Ghostkin, doesn't smell if you wash the bedsheets... but the incorporeal bit kinda fucks the purpose...
Zombiefifdom, have terrible food issues... you know how hard it is already to find a working brain, I imagine in the future...
Serial possession, looked promising, but the prospect of so many years of Pea Soup makes me a bit queasy...
I explored the notion of time traveling, but I can't hardly understand the young people of today, imagine skipping 975 years of memes... how long it would take to figure them out...
Yep, it has to be Isekai... there's no other option...
Peace