Among the uncredited rôles in Under Capricorn there is a Mrs Riggs, who appears briefly in the ballroom scene.
Some rather poor screenshots here
The sequence is about 75 minutes into the picture and it is a speaking rôle. Evidently a British character actress and not the man himself, though ten years on, could she have been in NxNW over the pond?
I think this actress has a bigger nose than Hitch, though it's easy to add inches in that area.
Most intriguingly, just before she arrives on the scene, her profile appears, projected on the dress of another guest. For a fleeting moment we see a more rounded profile like the trademark shadow he used on the telly shows.
Any more of this and I'll begin to feel like the bloke in Blow-Up, only without benefit of orgy.