Hmmm... Rei could you see if this is even mildly feasible (and by feasible, I just mean maybe possible, not practical)
First, take a character that steel rain resets itself on. I don't know which one is the best, but I know that it resets on Noel.
Activate steel rain (start with the corner, just for ease of doing) with 12 nails, and mash out some attacks that keep opponent grounded, ending with 5C daifunka about halfway through steel rain. If the combo resets after the first hit of daifunka, and you have 50 meter back, you can get something like 4, 100percent proration, 800ish damage hits and then rapid into a combo.
Lol