Well, the trick would be how would you get to Ballos? Unless I create a new path to hell, you would need the booster 2.0 to survive the spike room. And you'd need to make it up to the Balcony, which is at the end of the game already... I could make it so you could blow out the floor early, and maybe bump into Curly before she is all banged up.
The Doctor would be alive still, and the place would not be crumbling... I wonder if Hell should be more peaceful then? Or are the wrathful angels always bouncing around... *amusing thought*
It certainly would be ... interesting if the Doctor and Ballos were to cross paths ...
I wonder if the seal room is even unsealed at that point in time?
... okay I don't see a Ballos battle happening any earlier than that UNLESS.
I pull a Chrono Trigger. Like how you can fight Lavos earlier than you should be able to. Maybe Ballos' magic will be at FULL STRENGTH if you fight him earlier.
I dunno how I can put it in plot though, at least in Chrono Trigger it makes sense if you are suicidal enough to want to go to the END DAY early. But, how do you get through Spike hell before getting Booster 2.0?
I guess I could make a hidden passage, like the one that Curly maybe uses...
Just put in a magical time traveling bucket.
Or add a slot to the teleporter or something. No need to add a tunnel or whatever.