Thank you! It can work for D20 games or WW/WOD games, etc... Just replace ∆Willpower with the constitution ability score/modifier or permanent willpower, respectively (and reduce it in kind) ; or drop it in as an add-on "module" by tracking a new dedicated "clock" entirely.
I originally figured MOTHER as the DM/GM/Storyteller et al. since it's a world/environment-level controlling entity, but there's no reason it couldn't be performed as a character by another player, or even multiple players, such as players playing each other's shadows in Wraith the Oblivion.
I should probably do something more with this than just posting it on discord or comment sections...