I bought the SW motech rack from someone here or the other forum in the classifieds for dirt cheap. For now I have Nelson Rig bag on it as I wanted it off the passenger area too. Great thing is its ready for a top case if I choose to go that route.
Here's a link of the rack. You might find it on other websites besides Revzilla...
https://www.revzilla.com/motorcycle/sw-motech-alu-rack-top-case-rack-kawasaki-concours-2008-2019