I recently bought one of MSR's bikepack tents (the Hubba Hubba Bikepack 2-Person). It has straps with stand-offs to mount about 1 inch / 2 cm in front of the handlebar. It also has an adjustable loop of shock cord at the rear. It is clear that I need the bag to sit forward of the steer tube by about 3 inches / 8 cm if I don't want the tent to drag on the tire. What are other people doing to hold bar bags forward? (I know there are metal gizmos that mount between headset spacers, but I leave in two days, which doesn't leave much time to have something shipped.) What am I supposed to be doing with the loop of shock cord? It seems like whatever solution I choose will have influence how much rubbing happens at the front of the frame.
(The spool of wire in the photo is just something I had handy that was about the right size to demonstrate the amount of stand-off I need.)