Can I spend an evade token to cancel the crit Ten Numb made uncancellable by defense dice?

No.

From the FAQ page 10

Evade tokens, C-3PO, and other game abilities that add results cannot be used to cancel Ten Numb’s result, as these added results count as defense dice results.

Once upon a time you could but the ruling has since changed such that Evade tokens are counted like dice and thus can not stop Ten or the various Autoblasters either for that matter.