Now I see your issue. But I don't understand your purpose actually. So you wanted to find a setup for astrophotography? If that's the case, are you going to track the stars? Are you piggybacking the camera onto your refractor?
In any case, an equatorial mount seems to be a better choice, since if you are properly polar aligned, if you can have the RA/ DEC markings on the mount, it makes tracking so much easier. Perhaps the ball head can be modified into an equatorial?