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No, he may not:
Upgrading to a Champion changes the model's name (from "Deathwing Terminator" to "Deathwing Champion"), only a "Deathwing Terminator" (i.e. model named X) can take from the Terminator Heavy Weapons list, and upgrading to a Champion replaces all of the model's weapons, so regardless of the order they occur in, it is not allowed.
This is similar (but sufficiently different) to standard command squad apothecaries taking special weapons, which gets a mention in the new FAQ's GW are working on.
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