This is interesting to say the least. Idk how it would be implemented though.
There's Splits for nearly every category in the resources tab, and Slaurent has a HK Splitmaker website that is linked there as well. LiveSplit also has a function that allows you to download Splits directly from Speedrun.com boards (If the run has Splits.io linked). Links: https://www.speedrun.com/hollowknight/resources , https://hksplitmaker.com
the src rules state that it is not allowed to modify the game in any way, with the exception of LoadNormalizer. (Keep in mind that i am not a src or discord moderator, and there are people more qualified to give information on the src ruleset)
cool idea tbh. i'm not on the mod team obviously, so i can't really do much. But, you could try talking to one of the mods, they might be open to it.