I've worked hard to befriend my crow flock. They used to live here only half the year now one family stay all year. I have a wide variety of murder birds that they protect my flock from. I wish mine were that tame. The youngest comes and caws for his eggs from the back fence. If I'm running late, he tries sneaking into the shed for an egg raid. If I bust him, "no rook! You take the eggs I PICK for you!" If I go a few days without 'paying my protection money' they wreck up the place.
So, yes. Befriend them. Choose a feeding place, choose a feeding time and train them. Since you started out with agression and you are now providing them entertainment, (they are really, really, freaky smart I dare you to google some of it I think its on cracked) you may already be screwed, but its all you've got!
Your crows must be much friendlier than ours. I've seen them pull a Sussex chick through the wire of an A frame coop. I definately wouldn't encourage them.