Possible to transfer DPP to another line, which leaves a line open, then add a new line for BOGO iPhone Xr?

Here is my situation. I have a 10 person family plan. All the lines, but two, are eligible for an upgrade. I want to take advantage of the BOGO offer, but I can no longer add a new line to my account.

Is it possible to transfer my DPP (Device Payment Plan)to my wife's line, so that my line can be ported to Google Voice and terminated from Verizon? Which then leaves an open spot for a new line? Then use an upgrade to get an iPhone Xr, and add a new line to take advantage of the BOGO? I don't care if I have a new # because I can just use Google Voice which will have my old number once it's ported?