D&D 5E - Fixing Channel Divinity: Twilight Sanctuary

What do you think about just letting people benefit once per use. So no more "I rolled a 3 last time and have not lost any temp hit points, so I am hoping to roll higher and reset it to the higher number" nor will there be "I lost all my temp hit points last round and now they're back." That would allow essentially a single burst during combat (though still dim light, and the benefits to charm and frightened,) though if someone was outside the initial radius they could get into that radius to get their one time benefit later on during that minute.

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