Not an expert, but I don't think a wink, wink, nod, nod from anyone will make it legal for you to own a suppressor in Delaware. Probably best to just can that idea. In Delaware the DSSA, Delaware State Sportsmen Association, is the NRA affiliate. Theses are the guys that have helped keep some of the stricter laws off the books. Welcome to De.
EDIT: As a resident of Delaware, your out of state conceal carry permit will not be legal here. You must apply for a resident permit. Not impossible to get, but does require a few hoops to jump through.