Not sure what you mean by the western route- Do you mean the Atlantic Route? if so it's virtually tarmac all the way unless you are taking the beach route to NCK.
But if you are going to be in permanent sand, then I would consider this a must-change.
I would recommend DID X-ring 520 ( I use one on my F650 Dakar- sorry no idea for the KTM) or the 'Z' if you want the top/best/toughest
You care for chains in sand by NOT lubricating them at all - Keep the chain dry-
Steel sprockets is the way to go IMHO
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