Talked to the Apple Rep and she said yes, that was the way to do it. Order on the upgrade line, and then call Verizon to have that upgrade switched to your line.
It was covered here before but since Verizon was using a seperate system to handle the pre-orders, they could not support the 'buddy upgrade' feature which lets you transfer an upgrade from one line to another on the same family share account.
Verizon has stated in their FAQ that users can upgrade on the eligable line and then migrate the device to the line of thier choosing after the fact. You will have to activiate it on the eligable line first, and then do the swap.
