Zeal, Nope. That wouldn't last throughout the day. I've styled many many people hair in my life. I grew up with friends in the rocker scene of all kinds who all happened to be DBZ fans. All different hair styles. I did mine like Gotenks before and while it did stay, because I used beeswax (which would be terrible for 17 and not work right) I also always loved 17 and so did all my friends. I tried on just about all of them, including myself and his hair was the one that was impossible to do. It only works on short haired Trunks style because there is so little hair. The hair weights down and that's why it doesn't work. It works in wigs better because they aren't real hair and you can force it to permanently stay that way, which is why I would do that instead, but Kuroki refuses to wear wigs so not a who lot he can do..
Kuroki, if you find time, come over and I'll see what I can do to help and then whatever technique works best, we can do that at the con for you.
By the way, what hotel are you staying in?