Waiting until you get to Orlando is too late, the behind the scenes carousel folks may already have grabbed the luggage.
With this short notice you may be better off not using the tags but instead attaching a bright colored ribbon* to each suitcase. Upon arrival, when you go to the ME welcoming area, advise the CM's there.
If you are daring, completely black out AKL and clearly hand print Polynesian on your existing yellow baggage tags and use them. Also black out any bar codes.
Disney hints:
http://members.aol.com/ajaynejr/disney.htm
*Let's start a fad! Make up 3x5 cards each with the same 3 digit number of your choice in large digits (and your name in smaller print). Plaster two on each of your suitcases. This way, if it is necessary for airport staff such as ME CM's to go find your baggage it will be a lot easier.