What better way to say "I'm the Captain now"....you need dem stripes!
Curious, is this your first upgrade at an airline? It really isn't that exciting to have the 4th stripe on your shoulder, I sure wouldnt have paid to have my 4th because the company cant get their act together.
Again, they are paying you as an FO anyways during OE.
Not trying to knock you, it just seems you really want that stripe...really bad.