Fine Paul Smith leather shoes - Stain

[Hugomuch]

Hi Roger:
I need to restore these fine leather shoes.
There is a stain in one of the shoes (from 10 years ago), we don't
know the origin.
The objective is to remove the stain without darkening the color, as
well as nourishing and protecting the overall shoes, again, without
darkening the color.
Do you think this is feasible?
Thanks