Congrats in advance on your new bike.
While I am indeed a Versys rider, I used to work for a Yamaha-Suzuki dealer. By the time a vehicle has sat around a couple seasons, the dealer has reached a point with the mother ship (manufacturer) so that the interest they are paying and have paid to date on that machine starts to be substantial. The "margin" you think they are making on it that was skinny even back in 2015 is about non-existent a couple years later.
Granted it's just one season-non current, they might be profiting from the "set-up" and delivery fees but perhaps not much beyond that at this point. Their ability to "throw in" stuff on a deal is not what you might think, based on overhead, having to pay wages and so on.
You can try, or ask for all you want, but in reality- you might be surprised when they say "no".
Typically if you ask-- you can often get 20% off for awhile on accessories you might source through them. Maybe score a jacket or some boots and take a discount if you don't need anything for the bike right away. I had seen my dealer also throw in a bike cover on some occasions-- you can get by with a cheap one, and they are nice to have sometimes.
Lastly, you can sometimes negotiate towards that first service appointment that will be coming up-- maybe get them to compose a note on your closing-paperwork that allows a discount, etc., towards that first-service appt.
Just some ideas brother, I did not work in sales, but I heard the stories. It may not be gospel, but it's what I experienced.
I know some dealers that laugh and say they make more money off lawn mowers and tractors vs. motorcycles-profit, so go figure.
All the best in any regard,