Can't help with the Photoshop, but I was playing around with the handy Offset Calculator.
http://marksink.com/tire_wheel_offset/offset.html
So, I know that a couple of guys (Greg included) run 17x8 +35mm wheels with no problems on strut clearance (or even Z brakes, but that would depend on the style of the wheel itself).
According to the calculator 17x8 +35mm setup gets you 20mm closer to the strut than stock and pushes the wheel out 30mm.
A 16x7 +42mm would get you 15mm closer to the strut body and pushes the wheel out 11mm.
Just messing around with the calculator, I don't think it would look particularly awful. If you're OK with the slightly sunken look of the OE wheels then the Motegis shouldn't be a problem aesthetically.
Still, you probably want to check with the gurus in the Suspension forums.
BTW, I may be interested in buying your OE alloys if you get the Motegis. Hit me up via email if you're interested in selling 'em.