OP: why would you want to exchange cards? Apply for a new one and get the bonus, too!
Even tho you're not a UA 1K anymore .... this summer Chase offered a 50,000 sign up bonus, even if you were applying for a second UA MP VISA card.
You know better than that ..... get as many points as possible.
BTW...where are you going next? You bailed on *A and lost your status. now you want to bounce out of SkyTeam. Is OneWorld next on your horizon?