My dad has put Givi or Givi knock offs on all sorts of bikes, i'm sure you can buy a mount or modify one. The last one he did was a knock off Givi he put on a honda 125 dirt bike.
Remember to shop around because you don't have to pay $300 for the combo (mount and trunk) and they come in many different sizes.
Craigslist (for the trunk after you found a mount)
2009 Street Triple 675 R
12,000 miles and some-days it still scares me.