HT producing even the Halloween costume Wanda and/or Vision might be a stretch. They typically don't do civilian looks. Especially when you consider that it would be at least two years before the figure actually shipped, and the hype will have long since died down. Also they're probably already sitting on at least a few Black Widow and Eternals figures that they haven't been able to show due to the scheduling delays, as well as upcoming figures for Falcon & Winter Soldier, Shang Chi and Loki. If anything they'll produce actual superhero costumes, meaning SW Wanda and Cataract.
That said, I could see one of the knockoff 1/6 companies quickly jumping in and cranking out themed WandaVision H+C sets while the iron is still hot. For the most part it's recasting the Elizabeth Olsen sculpt and applying different hair and paint, recasting the Vision HS (maybe modding a couple into Paul Bettany), tailoring the outfits (most of which are pretty basic), and throwing in a few props.
Conceivably, they could do several sets:
Episode 1 D*ck Van Dyke
Episode 2 Bewitched
Episode 3 Brady Bunch
Episode 5 Family Ties
Episode 6 Halloween costumes
Each set could come with a Wanda & Vision head sculpt, outfits, hands (and maybe female arms) for the B&W episodes, and a couple of props for each show. I could easily see those going for somewhere around $175-$200. They could even knock off the Toys Era or SooSoo Evan Peters QS and make a Halloween costume "Fietro." H+C sets would probably be the quickest way to turn these and cash in, but they could go the full figure route.