Sorry, mate, but there's no hope here. There used to be some stuff like this way back in the day, that worked pretty much like you just 'discovered', but it's all gone.

The important 3D sites try to stay as clean as possible so the big cc companies and paypal don't drop them like a hot potato. DAZ was always a kindergarten in that respect, rdna as well, rendo only a little better.

Renderotica used to have some edgy stuff, but they cleaned house a while back, a lot disappeared and it's not coming back. I think the only artist who used to specialize in violent matters that is kind of still around is davo and his shop has been pretty dead for a while, too.

If you can't sell stuff like this, there's no way someone would create it, it's a lot of work. Like, a LOT of work. You'd need several insanely variable props that can follow an immense number of morphs and a just as immense number of movements and then some really nice maps, which you'd have to paint yourself since there are no photosets for this. No gonna happen. If we're very lucky at some point in time someone might release something like Severed Man again and I'm not too optimistic it will happen.

Also in this day and age I would assume you'd best work with .duf files and possibly geografts. V4 had a good run, but she really starts to look a bit long in the tooth. Go Gen 2 or 3.