I like killa's knife, but I'd never throw it.(Reminds me of a kunai) Just call it a "survival dagger" or something like that.. The best knife for western knife throwing, IMO, is an old Mauser bayonet. Cheap (15$) strong and heavy.
As for martial arts, yes, throwing weapons is an important skill. Sticking them in the target is NOT important, but being able to throw it is. Shurikenjutsu is an essential skill in real martial arts. (what some westerners who copied it call "no-spin" throwing.) But once you master shurikenjutsu, it doesn't mater WHAT you throw: screwdriver, knife, pencil, paintbrush..You'll be able to throw it and probably stick it, but again, sticking it doesn't matter. The budo purpose of throwing is really just to get the guy to close his eyes and turn his head or maybe even duck, giving you the chance to get away or move to a better position or maybe just to scare the guy and let him know you are ready for him. As to balance for such objects - it doesn't matter. Some shuriken (throwing weapons) were tail-heavy, some nose-heavy, some balanced in the middle. Once you understand how to throw, get the feeling of it, then you'll instinctively adapt your throw to the object.
I do know that Aunt Yangdu has been interested in new designs to expand HI's offerings, so please do draw out a full-scale sketch of your knife and mail it to her.