CP is a punk who doesn't deserve to be a Celtic, he will leave and we better keep Rondo now, Only trade Rondo for Howard then sign Deron,or if Howard becomes a FA (unlikely at this point) we sign him.
Besides even if we trade for CP and West we couldn't get Howard,you'd have to send West to a 3rd team to get room for Dwight, but it isn't worth it anymore.
Keep Rondo and try attract Dwight with his play, this season Rondo has a chance to improve his game.