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I have been offered the opportunity to attempt a crossing of the Simpson desert on my crf450x (heavily assisted) on my list of things I need is a spare set of rims and tyres. The catch is though I have been wanting to get a set of motard rims for my bike as Im sick of destroying the tread on my stock tyres but now in this situation I'm left needed a spare set of dirt tyres and rim. Anyway my question is, is there any possibility of fitting dirt tyres up to motard rims? Which I could thend eventually swap back over to slicks when I'm ready?

Also we are talking 4 days of pretty gnarly sand riding, so they would need to be able to perform should I get a flat or what have you