Wait a year and see if it's added to the crown store, like they did with Morrowind's collectors edition items. You could also send a support ticket in and see if customer service can charge you the difference and switch you to the collectors edition. It seems like something they could possibly do.
Runs| Orc Nightblade • Chim-el Adabal| Dunmer Templar • M'air the Honest| Khajiit Templar Oddity| Altmer Sorceror • Drizlo| Orc DragonKnight • Lady Ra Gada| Redguard Sorceror Taste-of-Hist-Sap| Argonian Nightblade • War'den Peace| Khajiit Warden • Little Warden Annie Altmer Warden Ports with Blood| Breton Templar • Dirty-Old-Man| Dunmer DragonKnight • Eyes-of-the-Sun| Argonian DragonKnight Bleak Mystique| Nord Warden • Polychronopolous| Imperial Sorceror • Bullcrit| Khajiit Nightblade PC NA CP 1250+ and still a noob At Writs End - A place to complete master writs