VZW does not have that bad of tech support. Yes you can call them to change your blackberry email address. It would mean that you would lose your old settings, ect ... that goes with it. Basically it would be a fresh start.
You need to call up data tech support, the number is in the forums. Tell them that you want to delete your BB web client account and create a new one with a different user name. All carriers have a BB web client admin tool to do this. They just need to log in and delete the account. Then either you can have them create a new account or you can go to the web client account and create a new account. To do this you need your pin and esn which are under the battery.
Any time you have a tech that does not know how to do it, tell them you have another call and you will call back.