Lol... nice pics
For loading, you are interested in the max height, and beware double bubble as they are slightly higher. As far as seat height goes, you are looking at about 30 inches.
Center stand? If you get a "pregen" then it (should have)/will have a center stand, if you get at 2008 or newer, there will be NO center stand. Either way, no big deal. You can spend $50 on a center stand or a rear paddock stand & spools. Your choice....
Pregen fairings are getting increasingly hard to get, so plan as such. New gen fairings are still pretty easy overall. Colors are year specific but can be matched up at
https://www.colorrite.com/
I see you are leaning toward a pregen, cool!!!! I have one myself, I feel its stronger than a newgen, but tire options are a major factor unless you do a wheel swap. Your call sir....
Good luck with your choice and hope to hear from you soon about a "new to you" 250.
Best!