I've done some similar bar-bending with aluminum to make a front bag rack for a daypack, since I don't (yet) have any nice, large, randonee type luggage for any of my bikes. Nice thing about these, if you screw up and make some unusable bends, you're only out four or five bucks with the price of aluminum stock

Below, one small rack for smaller, lighter bags and one extra long one for use with a tall headtube or high stem:


And a medium one, in situ:


The bag in the photo is a giveway daypack with the bottom reinforced inside and out with two layers of thin plywood stapled together through the fabric. The backpack straps knotted around the headtube and handlebars are your anti-bounce reinforcement. It works so well and is so quickly removable I haven't yet bothered to invest in a more elegant solution. The back pack is still usable as a backpack, too, for those bike/hike days of summer.