In short:
B Ellis > GCS for end 1st round pick = pick 20
Butler > Carlton for pick 46 (I'm being realistic)
MKac + Menadue > Fremantle for Cerra if they'll bite.
Go to the draft with picks 19, 20, 38, 39, 46, 72, 74, 92. Maybe trade some of them for 2020 picks to ensure enough points for MR Jr.