I'd plant autumn fruiting raspberries in that space. No supports required, cut them to the ground in Feb, and keep an eye out for suckers trying to escape the bed. Try and make sure you have a really weedfree bed before planting as they are shallow rooted plants and difficult to weed around so you could either plant through membrane, or heavily mulch to keep weeds down. I had couch get itself established in my old raspberry bed and despite my efforts it eventually weakened the plants so much I dug them out...
