the freebie shapes wizard is the way to go, just, you may have to research bolt hex size standards, as the wizard measures from point to point, not across the flats. took me a few goes to get a good 13mm size nut, and now i realise that a plain tommy bar was better for the job(toolpost)
theres a few alternate methods, all involving not much really.
you could do some maths and use the bolt circle wizard, modified slightly with notepad.all my experiences with bolt pattern say it doesnt make arc moves, it makes definite straight line interpolated moves from one point to the next. it calculates the coordinates. "Create arc" and "circle pocket" are making arc moves.
with a rotary table, you could use a simple Z to depth, X to face, (or whatever suits the machines capabilities....) retract, return, index, repeat ad nauseum. get to use one of those m98(or g98?) sub routine thingies
run the table in any old orientation, A,B, or C
could use an endmill, could use two saws and a spacer on an arbour, centralising spacer on centreline,this making for only 3 rotations, um...
could even pull it of on the lathe if you can mount an appropriate nut to the screw and turn it 1:1 with the spindle,cam driving the slide... nut size determined by depth of cross feed...
could even use the spline wizard with a rotary table
just a really wide tool. dont tell it that but! the computer says no