...Google voice won't forward 2 different GV numbers to the same cell phone
Can you deal with telling Google that both numbers are "home" numbers? G will allow two different GV numbers to forward to the same home number--that's why my spouse and I do.
The main thing you lose by telling G that both are home numbers is you can't have GV forward texts to the phone. However, if you install the GV app, or the Hangouts app, then you can receive AND SEND texts using the GV numbers.