I agree about the pyracanthea. They look fantastic and attract the birds to the berries in winter, Yellow, orange or red.

Before you consider ripping out the rose maybe you should test for dryness at the roots. Between two walls it might be bone dry down there.

Take a peice of 15mm copper pipe like the plumbers use and hammer it down into the roots about a foot. then waggle it about and lift it out. Push out the soil core from the tube and check how wet / dry it is. If its dry, what ever you plant, keep watering!