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First of all, I respect your headcannon
but.
Metaton wanted to absorb Frisks soul and go to the surface, why wouldn't he do that with Justice?
If Muffet killed Persaverence, she wouldn't be strugling financialy
I doubt sans would kill a human
Sans is too chill for that shit
Back in my phase when I had practically the same headcanon, I reasoned that this took place before sans made his promise
The promise sans made should not be that old a year at most and weeks at least, since any monster in sans generation doesnt know what a human looks like so it has been more than 50 years at least since the last human fell and the dialogue implies than sans and toriel have been friends for a relatively short time, my headcanon is that they have known each other for 2 years at most.
So it is save to assume Sans made the promise not so long ago before frisk fell in the underground, so again probably a few weeks back at least and a year back at most.