After about 3 weeks of searching for ways to do this and overthinking it many times, I think I finally came up with the KISS solution. First picture shows the difference in length between the stock Yamaha pipes and the Cobra Slash tips that I have gotten. My initial thoughts were to use the Champion exhaust hanger (pic #2) with the bracket that came with the Cobras. This was a miserable failure. The inboard pipe hit the trailer hitch and both pipes hung entirely too low.
During a visit to my local Home Depot I came up with the idea to use angle iron as my homemade hanger. After a few mock ups I came up with the bracket shown in pic #3 and mounted in pic #4. Pictures 5 & 6 show the Cobras mounted to the bracket.
Next up: making extensions to make up for the difference in length between the 2 sets of pipes.