Warp Files

Hello all.

We are planning a "simple" spherical projection on an inflated ball.
Looking through the warp presets there's only Horizontal or Vertical
cylindrical presets, not full spheres - from what we can find.

Does anyone have experience doing this? .. and want to share their file?

I have a bit of a mathematical model in mind but really don't want to
sit down with excel and code it!!

Cheers
Kyle.