I think your best bet would be to do tons of research, and then SHOW them you have done tons of research.
Tell them that you will always wear all the proper safety gear (helmet, pants, leather gloves, etc..) and show them WHY you are going to wear it (have statistics ready). In fact if you have a little money saved up then show them how serious you are and go buy the gloves or helmet or something, that way they see that you are willing to spend your own money for it.
Also tell them that you will buy the bike (or if they buy the bike, that you will pay them back and have a whole payment plan worked out), and that you want to start on a smaller bike because it would be cheaper and easier for a new rider to control. Tell them you want to take the MSF course and everything and I’m sure they will consider it.
Worse case scenario is you only have to wait 3 more years until you move out and then you can get one
~Best Beginner Motorcycles Admin