The contrasting form of Maynard and Tyson in the second half of the year has made Tyson very expendable. The best way to get Lever without giving up too much would be to get Tyson to another Vic team.
Something like...
Melb - out: Tyson, pick 10 in: Lever, pick 38
Adel - out: Lever, pick 18 in: Gibbs, pick 10
Carl - out: Gibbs, pick 38 in: Tyson, pick 18