I just posted something in my original post on the topic..... A client of mine is a manufacturer of these types of awnings, and actually made one for mine. We got the sidewall blueprints from Crossroads, but after considering it, Camping World suggested not to try affixing it. They searched and searched, twice, for alternates like you mentioned. In the end, they suggested not messing with the warranty.
So we are back to an EZ-UP and or Harley's idea of threading a tarp in the rain gutter.
2014 Crossroads 270BH towed by a 2008 Sequoia and filled with family, friends, and great memories.