Chris, while I am not the best person to advise you on this, I think one of the attractions to graff is that the addition of malt extract and grains allows for a more fully rounded drink.
One of the reasons I tried brewing a honey graff was because I am in Florida and I don't have access to good, fresh juice blends that are suitable for brewing a good simple cider. The first several batches of cider that I made lacked any body and truthfully any real flavor because I didn't have good juice. For me it is kinda along the lines of adding raisin, tea and lemon juice to build a more complex, well rounded drink.
I think if you start with a good base juice to make your cider and then try hopping/dry hopping you might, and I stress might, be able to get something that is worth the effort. On the other hand I would think that hopping a cider made from commercial store bought juice might be like trying to make a song out two notes where the notes aren't necessarily even in the same key.
That being said I am still very new at this. Give it a try this forum seems to be all about experimenting and building on knowledge. The one big thing that I have gleaned about hopping cider, and it is something I will adhere to if I hop my graff, is to do so in small quantities