You will be fine, though (as you may be aware) those RS3s will have definitely fallen off noticeably in grip by now due to the number of sessions. I tend to run them down as well, but they definitely fall off a lot compared to new.
And FYI you can fit four unmounted 275 RS3s in the backseat of an e92. Not sure if you have tried yet (I have done four in the back seat and then tools/etc in the trunk). It's a tight fit but doable.