i like the ones in the bottom pic, they fill the guards better. also i think getting the rims machined to suit seems like a whole lot of effort.
as for the tire width. if you think about it, a 235 wide tire on an 8" rim will have a different fitted shape to a 235 tire on a 9" rim, this could reduce the rolling diameter, probably not by much, but it maybe enough to mess with the ATTESA. its just safer to rim equal width and size rims.