The only pure salary dump that makes sense, in my eyes, is Bickell and his $4m cap hit. I would roll the dice on Versteeg at $2.2mil caphit since you will have replace him with a below average player that is making around $1mil anyways and Versteeg has shown that he can play top 6 and an effective top 9 role at times. Of course, he does have a tendency to disappear at times but with the makeup of the team and the cap crunch, I think he is worth the risk.
I'm against getting rid of Shaw ($2m cap hit) in anything that isn't a "hockey" trade and Hartman definitely needs some time in the AHL. I know he had an exciting first shift and first game, but after that he was badly overmatched when it came to speed/size. If he keeps playing his game though he can certainly be a guy that the Blackhawks look to down the line.