If the fence is up, then it is up. If you had asked your neibour to erect a fence with a louvre effect to allow sun through but keep the privacy. . . .
I don't think there are any veg' that will grow in this situation at this time of year. North facing is a bit of a beggar too. Thornless Brambles is the only thing I can come up with, but others may be able to help. Cheers, Tony.