I see things differently. C's aren't winning a title this year. They also aren't likely to be resigning most their FA/RFAs to be. So go hard on a starter upgrade and make due with an even worse bench for the sake of the future.
Smart, Baynes, Morris, Yab and Nader for Cousins.
Resign Cousins and go into next season as the heavy favorites to win the EC.
Irving, Brown, Hayward, Horford, Cousins.
Rozier, Tatum, Semi, Theis.
You also might have two first to select guys to help the bench. And you can sign title chasers.