I'd suggest looking at nitrogen fixing trees and bushes such as black locust, honey locust, and alder as companion neighbours to your fruit trees
Emile Spore wrote:
People seem to overemphasize food forests to me... honestly I am more interested in pasture/tree crop systems for raising animals.
Of those three , only black locust (Robinia spp.) and alders fix nitrogen. Honey locusts (Gleditsia triacanthos) don't.