So my compromise is a set of Givi E21 bags. They're smaller, look like trashcans to me, but are lockable, removable and should work fine for the '97.
http://www.twistedthrottle.com/trade/productview/30

Since GIVI no longer makes sidemounts for the XJ600, I'll have to make my own. I purchased a set of the latch kits from Twisted Throttle and will make my own sidemounts when I have the bags to design from.
http://www.twistedthrottle.com/trade/productview/4084
Here's the instructions for adding the Givi mounts to the SW Motech racks. I think it'll be simple enough to build a set of plates that I can bolt to the stock frame mounts and use these to adapt the bags. But we'll see.
http://www.twistedthrottle.com/filemana ... load/2269/
I got both the bags and mounts for under $220 from TwistedThrottle. More to come.