Yeah, its not realistic. The guys I would be looking to move would be Dak and Diggs. Just trade Diggs for picks and you don't touch Dak's contract as Stash said earlier. If he can't perform this year, cut him.
Gallup should be cut after this year if he can't get up to speed. DLaw is also probably gone after this year.
This isn't going to be popular but the guys who are value contracts in the prime of their careers tend to be offensive lineman. Since they don't depend on speed, they can be effective well into their 30's and frequently have long careers. If I was trying to figure out where to allocate cap money, a good chunk of it would go there.