I believe youd have to transfer the account to a clean phone. Lets say you are like mancow, you're getting the x (this can be your dummy phone), so you want to transfer from your dinc to your x, and from your wife's droid to your dinc.
You go to verizons website, log into myverizon, there should be a link to activate the phone. Go through the process, input the esn of the droid x and put your phone number.
Then, go back in, put the dincs esn in, and then put your wifes number.
There you go.
Oh and if you were using the droid x as your "dummy phone" (Not that anyone would) then just transfer again to your droid. Same process.