Unless you get remarkably identical lookalikes, Nikki kinda just looks like a random girl. Compared to someone like M3GAN, who has a recognizable costume, wig, height, mannerisms and poses; Nikki really has none of that.
I love Obsession to death, and I expect to see back-to-back ads for it all season in those house queues, but I just can't picture a way for it to work as an HHN offering.