How to generate an mostly plains landscape with some mountains on an floating island?

[havi05]

When I use the floating islands template of minecraft as noise setting and choose mountains and plains as biome, the mountains are not higher than the other environment of the islands.
Can I somehow set it to generate a normal minecraft world ( if possible with own biomes) on floating islands?

I want to be able to fly with an elytra from bottom to top through the world (that's why I thought of islands) but I don't know if floating islands is the right setting because it's not supposed to be an amplified world.

I hope someone knows what to do.