Are you fixed up at Salzburg for any specific reason, or is their some flexibility.
Several Hotels in Austria run a test fleet that brings both HB packages & the opportunity of a different bike every day, if that's your bag. Sadly, availabilty of an S10 is unlikely, as Dogdaze points out. I think the Grizzly Resort at St. Margarethen I Lungau is probably the closest to Salzburg, where they run a BMW 'testpool' fleet: -
Find them at < www.grizzly-resort.at
> A very biker friendly place & a baby GS would be the perfect tool for some mountain fun. If you click on a section that is of interest, then Deutch in the LH column, it brings up the option of English, rather than using a browser translator.