I was going to advise against a ball head with a monopod.
If the lenses used feature a rotating colar (Like your 150-600) something like this will give you all the movements you need. https://www.wexphotovideo.com/manfr...AP4utsm1kXHYi1m0IWb466ip6mVZYFvUaAtJSEALw_wcB
A ballhead is likely to be a bit of a faff.