Update, just got off the phone with DL and my +1's UG was not taken away and when I asked if it would, I was given a firm no by the agent. The agent did indeed need to split the reservation and linked one companion to each of our accounts. The agent that I spoke to was clearly new and told me she had never done this before, but she was very nice and was able to get it done without giving me any nonsense answers that would warrant a HUCA.