I assume you have a 660 enduro, rather than a rally?
I am a massive fan of KTMs, but you need to be aware that obtaining parts for the old LC4 engine on a 640 adventure was virtually impossible in Africa, outside Morocco, Togo, South Africa and Kenya. Given that 660s haven't been around anywhere near as long as the older LC4 engine, parts availability for a 660 will be even worse, meaning you will have to carry them with you or be prepared for expensive shipping via DHL etc.
My gut feel would be to trade down from the 660 to a 640 Adv, which is already purpose built for the job and doesn't require extensive modifications. DR350 would be fine for most of the trip, but might feel a little small on some of the long stretches.
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