How to resolve the issue of combining orange essence and RP

Change the client to display your points in both RP and orange essence. This would be done with something as easy as this "RP or (orange essence symbol): (insert number here)"

Stop producing RP cards and start sending orange essence cards to stores, etc. Mention on the cards that orange essence = RP.

Wait 3 months or so (maybe longer).

Remove RP from the client so it only displays orange essence with an announcement that they are the same thing.