<I was going to put all 4 Bridgestone tyres back on the car for summer. Now I'm thinking of putting the remaining PS4 tyres on the rear and use the Bridgestone tyres on the front to wear them out faster.>
That seems a wise decision, DazAuto.
And once you finish all Bridgestones, stick with Michelin. Makes a world of difference.
P.S. My Bridgestone Potenza S001 have done 17k and are all 5 mms front & rear (I am rotating them). So they will still last for a while... :-(