I'm using CAMWorks because I have access to it through work. I talked to the guy here (I work for a reseller) about the proposed motor setup and he said it is possible, but didn't seem to enthused about the idea. We could possibly get it to work, but at the end of the day it won't make a huge difference. The look of the head is improved, and the moment arms are reduced, but it introduces backlash and a can of worms with the post.
So I'll keep the B motor mounted horizontally like it is, but I'll add the second arm.