I'd revert back to the older Rover badge, (I know its down to taste) I can't think of a great deal though TBH, I wonder what it would look like with single round headlamps and a more upright grille, Or maybe a more modern take on the P6 grille, double headlamps but a more overhanging grille, I would make the rear slightly squarer but not a great deal,
__________________
|