No special access issues
Erm, park the car, literally throw your shoes out of the window and walk over to collect them from the bottom of your route...
Unless of course the Snowdon throngs have beaten you to it. Only option then is to return back down the pass and hope to find something in one of the lower laybys. If these are full, you have a several mile walk or busy bus ride from Nant Peris and are probably better off picking a different crag.