I don't think we have to worry about the sequel living up to BPS cause it's going to be a different beast. BPS is a main dish of Kade/Date with a side of history while S2 will be much heavier with history. I think S2 is a loose partnership with the government.
So since the twins aren't history figures, maybe the n'ek is the obscure historical person this time around, like how Date is. And even if Bella is playing her, they can just ignore that she looks like "Kade."
Oh who in the older gen will play older Date and Kade? That could be really interesting.