Bronze was an interior colour choice for all 1972/3 colours, except Corsica Blue. It was also listed for Paprika from 1974/5 and for Avocado, Pendelican and Turmeric from the end of 1975.
Therefore, you wouldn't necessarily have to change the interior colour to keep within a wide range of Rover combinations, although it might not be technically correct for the model year.
What sort of respray are you thinking about; I would stick with Mexico if it was anything other than a full respray, door shuts etc., otherwise Avocado, Paprika and Turmeric are quite unusual P6 colours and, IMHO, all suit the car. Many years ago friend of mine had a Paprika 3500S and I always thought it stood out, either amongst other P6s or parked alongside my Cameron Green one. I like the Avocado ones as well (as long as they are clean and well polished), although I know many think it's an acquired taste.
I did look at a secondhand Stag where the original owner had had the car resprayed when it was new (all documented), from Saffron (I think that's the correct name) to white, because of delivery delays etc etc.; they didn't do a proper job, so it was still the original colour under the bonnet (not a P6 issue, I accept), inside the boot etc. It just didn't look right and didn't do the car justice. He must have been really keen to get his hands on a Stag, that's all I can think.
What colour do YOU really want to paint it. If need be, you'll have to rig the vote