Not really seeing why you would ever get the ring.
100 Beads for 72 hours.
500 Beads for 3 charges @ 24 Hours.
You underestimate the laziness of people who don't want to teleport to Reisenjima just to refresh their buff.
As far as Esuna change is concerned: could be amazing if it works with Yagrush to remove Amnesia.
On the other hand, Esuna now only being single target with a long recast means next time Meeble ambu rolls around the mechanics will need to have changed or people will be unable to complete it legitimately. If it stays the same, React or a dedicated Barspeller with a good connection and good reflexes will be necessary, which can be hard to come by.