Alright, I've reached the Point of No Return inside the Northern Cave, then walked back out to see how the levels and items gained therein would fare me against the superbosses.
My initial plan was to do in VII as I did in V - take a small break on my way to the final fight of the game to challenge the superbosses, beat them, give it its own update like I did for Omega and Shinryu, and move on quickly. It's becoming increasingly clear that this won't work. Whether it's grinding the required stats/materia, or refining a tactic with the tools I currently do have and then grinding an hour long battle with it, all the paths forward will take several hours of play, and I have a bunch of things going on in December that limit the amount of time I can put into this (and into writing about it).
So idk. Abandoning the superbosses because I don't have time to deal with them feels lame, but on the other hand waiting to actually finish the game until, like, January while I'm standing on the door of the final boss would be ridiculous.