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Adapting an existing scheme is always a good place to start, there's a reason they're the ones that get shown and it's because they work!
White helmets and pads would certainly set them apart from the Wolves, especially if you can work in some non-wolfy icons and stylistic choices (maybe go for a more Greco-Roman style like some Ultramarines/
BA stuff?).
As for the white itself, starting from grey will do a lot of the work for you; it gives you a nice base over which you can paint a very light grey and highlight up to pure white.
All I'd think about adding is a nice spot colour just to stop them looking too monochrome (use it for the bolter casing, squad/company markings, that sort of stuff). Red and yellow are associated with
SW markings so maybe steer clear of those for now. A nice dark purple might work quite well against the grey and white. Something like this: