The standard 1200 low seat will fit straight on-apparently,not sure how much they are new but they seem to pop up for sale on here and flea bay from time to time.
Don't know how tall/short you are but,if it's any help I had me 12 ADV seat on the low setting initially (I'm 5' 10-ish 32" inside leg) and didn't like it,I've put it back to standard height now that I've added a few miles and I'm more used to the bike.
Steve.
put the std 1200 low seat on mine not for the height but comfort, i use a air hawk and with the std 1200 ADV seat its too high, bought the front seat £80.00 and the rear to match £50.00 didnt think that was bad, bike now comfi would highly recommend the airhawk 30hrs in the saddle in 3 days and my butt was fine without it I would have been in severe pain