Of course you don't need a radius block for levelling - it just helps and gets the job done quicker. Use a radius block that matches the radius of your fretboard - I thought that would be common sense?
A compound radius is a different kettle of fish - and a major headache. Your best bet is to send it to the plek machine because it makes no economic sense for a luthier to do it by hand. If you want to do it by hand, then you use different radiused blocks - starting at 12-14th fret. A fret rocker helps locate those high frets - but they will be pretty obvious if you string your instrument up with a low action.
Why you'd want to have a compound radius on a bass makes no sense to me anyway.
At the end of the day, there's different ways to do a job - best we agree to differ.