I think you have a few basic choices:
1. The Blue/Yellow Hybrid Hook is a solid/pearl combo. You could drill it to be a little smoother and/or slightly modify the surface (1000-1500 grit sanding + polish).
2. Columbia makes an equivalent ball, the Freeze. They now make a Solid and Hybrid, in addition to the original pearl, like the Hook series. They are of a similar quality. You can try a Freeze Solid.
3. Roto-Grip makes the solid Shout. It is also a very smooth, solid, meant for medium-light oil.
4. Motiv makes the Ascent Solid. Its stock surface is a little rough (1000 grit) but it is a similar ball meant for medium-light oil. A little dose of polish and you're back with smooth reacting solid.
If you fixed on 900Global, option #1 is your safest bet. Your driller can manipulate the drilling.
If you not fixed on 900G, then I'd go with the Freeze solid. Similar RG and differential and the ball was designed with a similar intent to the solid Hook.