How about this 3 team trade
Boston - Parsons, M. Miller
Cleveland - Dirk, Bradley
Dallas - Varejao, Turner, Olynyk, Harris, rights to Osman and Christmas, Cle 1st
Is that enough for Dallas?
It would solve some of Boston's roster problems and Cleveland just adds to its depth (and still has Haywood who can't be traded to Dallas which is why I had to get creative).