Yes...however, I'd expect the costs would be high, unless you're talking about role-players that you want to keep, not your 3/4D. The deal has to work for them...they're probably not going to agree to not take Pulock unless what they are getting for not taking Pulock is as valuable to them. (Because after the Exp. Draft, they can swap these spare D for F. I would expect them to take as many unprotected quality young D as they can. The rules are going to make it nearly impossible for them to get top-6 F through expansion.)
Also, I would expect the form of some of these deals to be more along the lines of their late-round draft pick for your late-round draft pick, plus a guy you are protecting but value less, plus the promise to not draft the guy you're asking them not to. (They have no assets to trade other than picks and have to offer something, getting back your late pick allows them to make an endless number of such deals as they're not depleting their picks making protection deals.)
So if you value your best unprotected D more than a good 2nd-line F...