What comes to mind is this. Make an adapter from 1 x4 for your stands. A piece 4-6" long with a hole saw cut into one end on center to fit a PVC coupler and epoxy them in. now PVC pipe 3 1/2 foot long with another coupler. or to stiffen it a tee and cross bar of PVC
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Bill of materials
2 ea 1x2 x 4-6"
2 ea couplers for the size PVC pipe.
4 ea 3 1/2' PVC pipe
2 ea PVC tees
2 ea PVC pipe the length to match your stands width.
This will be a H style frame. If you have access to a table saw a saw cut on center of the 2 top pipes will allow cardboard backers to slide in.