Typically I'd just bought a Givi monorack for my 900 (yes - one of those, "I might need it one day purchases).
  When after a good bout of browsing I found a lovely tiny Givi rack called the 'porter'. It seems to replace the grab handle unit and might not look too - unsightly. 
 It appeared that they were not being made anymore but maybe I was wrong or this guy in Germany managed to find a new one. 
 He will post to Europe it appears:  
SS Tail Rack  
  Not sure if it will impead (even more) access to the seat lock or not? 
 Frank