I really believe DM is looking for role players more than another star. 
I don't know if this team can handle another star in place of Danny in the lineup. Danny is a pretty good role player. He doesn't demand the ball, hog the ball, dribble the ball. He catches and shoots, gets to his spots, and plays defense while communicating well on the floor. You want less Danny Green mistakes? Then Doc, Tobias, Joel and Ben need to make sure Danny isn't in a position to make a mistake. They are the stars. Its their job to come to the ball and not force the role player to do something outside of his skill set.
If it were me, I'd look at smaller, longer term contracts for role players. 
Cedi Osman
Maxi Kleber 
George Hill
If you can add these 3 to the top 6 guys, you have one hell of a playoff rotation. Use TPE on Kleber, send out future picks. Use expirings and picks for the other 2 guys.
I'd start Cedi over Danny. 
Embiid/Howard
Harris/Kleber
Osman/Green
Curry/Milton
Simmons/Hill
With Maxey/Joe/Thybulle/Reed on the deep bench. 
Then you put Reed behind Emhiid when Howard is gone, and he plays next to Kleber as a rim protector who is more mobile.
And you insert Thybulle for Green next year.
This gives you a solid 10 man playoff roster for matchup depth, and a solid 12 guys under contract next season. 
How do you get there? Hill for Bradley, Scott and picks. Kleber for TPE and picks. Osman for Ferguson, Korkmaz, Poirier and picks.
Now, would you deplete the majority of your 2nd round picks in the process? Yes. Would you have to give potentially 2 protected 1sts? Yes. 
But, is it worth it to have more role players who can shoot the ball building longer term chemistry with your stars? I think so.
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