I ended up acquiring a used GIVI Wingrack without the light kit. No problem, just shortened my rear light stalks as instructed on this site. The Wingrack is an impressively solid piece so far - although admittedly I have not had the bike out with all 3 cases mounted and packed. My biggest hesitation was the Wingrack doesn't fit in snug to the rear bodywork - and this system looks like it is a little more closely spaced"
My Wingrack does fit closely, and as you can see from my Avatar, I ride with the bags on all the time b/c I like the safety of the lighting kit.