I was reading the thread on a Maya to Zbrush workflow, and had one of those "duh..." moments. If you start with a Sculpty Maker compatible ztool and export it as an object, you can send it to Maya and fiddle about with it there, delete history and freeze transforms, then re-export as an object file. It will still be compatible with Sculpty Maker, although the sculptmap will need to be inverted (Cntrl-I in Photoshop).
I made a 32x33 sphere that I just tested and seems to work, but I seem to be having some trouble attaching the .zip file to this post :/ But anyone can download the thirty day Zbrush demo and make a few starting objects with it.