I kind of think you are making too big a deal. My name is Kristin. I introduce myself as such, but am called Kris all the time. I really don't care. When I was born, my Mom made it clear to my Grandmas that my name was Kristin, Kris, or Kristi. Not Krissy. My Grandmas walked in when I was 1 day old and started saying "Oh our little Krissy." My Mom said it grated on her nerves, but she got over it. There were other things to worry about, and she knew they called me that with love. We have cousins that call me that a lot to this day. only close family gets away with it, as it grates on my nerves too, but I know they all call me that with love and affection, and I would never think to correct them. I would also take any day being called Krissy by my Grandmas to have them back. My parents feel the same way. When I was about 8 and corrected someone to call me Kristin, my parents swore they would never call me that again. I am their little Kris to this day.
for dealing with people who won't respect your wishes. I have gotten to the point where if somebody I know calls me Jenny I ignore them. If its someone new I will correct them and say my name is Jennifer not Jenny or Jen.
Now I see that you did think of it but are going to try to avoid it. 
