Thinking about how with new run adjustments endurance ring is struggling but thematically as holy rings that both are useful for sustaining a passively draining stat it'd be neat if you could combine them for their effects. Mostly food for thought but im curious on other people's take.
As a good alternative you could add a prayer requirement to prevent it from being too crazy early on or even raise the agility req but most rings besides zenyte and endurance don't usually have direct requirements to equipment. And it'd feel scuffed to tack it on just because. (Honestly I'm not hugely thinking it needs it because of the slot it takes up.)