Amplified start?

[Cosmology27]

So I had a thought, I want to have the first area of my servers world be AMPLIFIED type, then the rest be BIOMESOP. I've tried running the server world amplified, then shutting it down, then switching the server properties to biomesoplenty type, but the world just keeps spawning in more amplified chunks... is there any way to do what I want? essentially I want like a few hundred chunks around spawn to be amplified, then the rest of the world to be biomesoplenty.
Any ideas?

 

[GreenZombie]

You have to delete the level.dat file to make the server take on a new world generator.

 

[Wagon153]

You have to delete the level.dat file to make the server take on a new world generator.

Alternatively, you can edit the level.dat using an NBT editor to change the world generator from amplified to BIOMESOP. I've done this before in a beyond reality world.