What little I know about how crowns actually work, leads me to believe “fashioning” or “engineering” a non-standard one could only lead to highly unpredictable outcomes that would likely only be exacerbated with longer range shots.
The idea of the crown is to provide a uniform escaping of gases from the muzzle behind the projectile as it exits. Any inconsistency in this, or what I would call asymmetrical turbulence, will cause any number things such as yawing or in extreme cases tumbling in mid flight. In any case, it could and probably would change your point of impact but accuracy would always suffer compared to a proper crown.
My first question would be, What does the crown look like now? If f your crown is damaged, that could be your problem and a simple re crown would be in order. I would advise against trying to make a crown in any way but perfectly symmetrical and aligned to the bore and muzzle accordingly.