If you're really into this idea, the best thing to do would be to try to learn Flash yourself and make it how you see fit. I know you said that you wouldn't have the skills, but NO ONE does on his or her first flash animation. You have an idea that you're passionate about, and that is the first and most necessary tool you will need to go anywhere with any type of creative endeavor. Even if it seems unlikely, you will have ideas after this one that you will feel just as strongly about. But, if you work on this idea now, by the time you get to those future ideas you will have the skills necessary to make them the way you want them.
As an example, I spent five years working with RPG Maker before I ever made/finished something that I was proud of. Now I have three finished games. The work is long and frustrating, but if you truly have a passion about the ideas with which you're working, you will eventually be able to bring them to life.