Way to override overworld WorldProvider?

[robustus]

I've been messing with DimensionManager  registerProviderType and registerDimension to name a new WorldProvider class to use for the OverWorld but have been unsuccessful, have even tried to unregisterDimension the overworld and then rename new provider and register but no dice.  Anyone have any idea how to accomplish this? (I might add I am still using 1.4.7 if this method changed much since then i apologize, just have been too lazy to upgrade yet.)

[robustus]

I've been messing with DimensionManager  registerProviderType and registerDimension to name a new WorldProvider class to use for the OverWorld but have been unsuccessful, have even tried to unregisterDimension the overworld and then rename new provider and register but no dice.  Anyone have any idea how to accomplish this? (I might add I am still using 1.4.7 if this method changed much since then i apologize, just have been too lazy to upgrade yet.)

[Theoretikos]

Did you ever get an answer for this?