Here's how I reckon it might go.
Jetta to West Aust for pick 15/16 (1067 points). That plus our pick 18 (at worst for drafting purposes) gives us 2052 points.
Mills is bid pick 5 and therefore costs 1673 points. We still have 379 points.
Melbourne give us pick 22 for Bird (845). This presumes the draft depth is poor as is stated. This leaves us with more than the 1116 points Dunkley would cost us at pick 10.
I think we come out of that looking pretty good although our game plan will need to change without Jetta.
So, in effect, pick 18, Jetta and Bird for Mills and Dunkley.
Dunks apparently wants to stay in Victoria but as it stacks up, there are a couple of clubs in the middle there that could draft him and he may take the F/S option rather than risk a GWS or Adelaide result. If Richmond were to drop to 7th or 8th it might be different.