Here's the Imgur Album with a video and the trick
The spell's idea came from this post
It simply makes a vector at the start with the desired radius of the sphere and on each step it rotates it by a number that doesn't cleanly divide 360 and is also different on each axis.
I copied this twice and simply added an offset of 180ยบ to the second one to make it twice as fast, unfortunately it's still really slow, although it's faster if you have a smaller radius.
A square would be way faster since Conjure Block Sequence exists (Probably about 3 seconds total?)