I would suggest the same - AE’s polish doesn’t seem to have much pigment and I’ve had almost instant success when I’ve tried Saphir’s version.
For walnut, I think they have a light brown that would work well, specifically in the
saphir medaille d'or polish. But you have to pronounce it with in an over exaggerated French accent to get it to work.
If you pronounce it properly, you can also refer to it as sovereign grade