Theory to the rescue!
This is just theory mind you, I have never gone for a wish strategy and I hardly use undead so I might be overlooking something, but...
If casting wish is on the table, why don't you just use a wish to cure the wight of all afflictions?
Alternatively, summon a unit with heal (if you can) to get rid of the wights wounds.
I think all of the cleanest kills are already suggested.
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I mod because I love it.
All hail Fury the (aptly named) Great Hawk.
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