you don't HAVE to get rid of these tyres mate. 225s will give a decent enough stretch on your front wheels if they're 8.5j.
I have 225s on my mk4 with rims on 8.5j and had the coilovers wound all the way down. rubbing will only start if you fit spacers that are too big. I'm guessing the 3SDM's are around ET46? if so I reckon 5mm on the front and 15mm on the back.