The more I think about this, the more I think the answer is to take the ball out of Hayward's hands. Don't bench him but stop using him as a primary distributor.
Look at the overtime against Toronto, when the offense has looked as good as it has looked all season. The first play, Kyrie gets to the rim, has his path closed off and dumps the ball off the Gordon because Gordon has made a smart move to right under the basket. He kind of blows an easy lay-up but gets fouled and gets to the line. The next possession, Kyrie brings the ball up and posts up Hayward who knocks down an easy turnaround jumper.
I think one of the problems is Stevens is trying to use Hayward how he has always been used (both in college and the last bunch of years in Utah) which is as a combo scorer/distributor but Hayward now has someone who is a better scorer (Kyrie) and other guys who can distribute (Horford, Smart) and because of the injury, Hayward can not get separation when he has the ball. If he can't get separation then he's only playing to pass but if he's not looking to score ever, that makes it harder to make those passes.
On Lowe's podcast yesterday he was talking about how Hayward is asking for picks even when he already has what should be an advantageous mismatch. Stevens has to take the ball out of Hayward's hands. I know he makes good decisions with the ball but he also makes good decisions off the ball. Making cuts and spotting up can get him into rhythm he's been missing and put other guys back into the roles they're familiar with.
It's time to take the ball out of Gordon's hands for a little while.