Rabaconda Street Tire Changer

[mspratz]

Yes it is. You need that, or, I think they have a universal single-sided-swingarm-wheel adapter that might work. 
You could call and ask them to add it to your existing order so you don't have to pay another shipping charge. They are very accommodating; it is worth a shot.
UPDATE: Having just had a quick look at the universal adapter, I don't think it will work for the BMW.
UPDATE2: Maybe it would; it specifies up to 68 mm, so might be fine for the RS (62 mm) but not for a K16 (72 mm). Ask them!

Thanks Michael. I called the number but got a voicemail so I emailed them asking whether the Universal Adapter could be included in the original order. Let see what they say. Worth a shot to save the US$12 shipping.

UPDATE3: Having had another look at the RS's rear wheel, I don't think the universal adapter will work, not because the diameter is wrong, but because the center of the RS rear wheel is less than 1" from side to side, and the design of the universal adaptor is such that it needs a much wider wheel center for the cones to contact both sides. Sorry to mess you around.