I don't see why you couldn't use a luggage rack and sissybar. Spacers and longer bolts. It would set the bags out farther away from the bike though.You can do almost anything with a little thought and making a few small parts. I can't count the parts I have made out of stainless then polished up mirror finish. Looks better than the chrome.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!