I did see one place that offered blank shanks that I assume you thread yourself so what your proposing should work,so long as the shank was large enough to begin with.Like I had stated before,most of the rod ends I found had the shank diametre and the hole diametre the same.But Yamaha,in their infinite wisdom,made the shank 12mm and the hole in the ball only 10mm,and I have yet to find a rod end in that configuration.It might be easier to drill the holes in the bulkhead larger to accommodate 12mm bolts.