Yes, that will be the ticket!
Over the past ten years I've used pretty much every wheel possible for autocrossing with a narrow bodied 911, and the 7x15 Revolution wheel is a good, inexpensive solution for using 225s. No need for spacers or longer studs like a 7R wheel. Yes, they are a bit heavier than 6x15 Fuchs - but the wider rim will more than make up for it. Have fun!