I was initially excited about the prospect of Zuckuss on a Scum epic ship, but the wording and order of operations on the card suggests to me that it doesn't work if you can't take the stress.
Focus, evade, and stress tokens do not affect huge ships. When a huge ship receives any of these tokens, immediately remove them and return them to the token supply.
Huge ships can take stress tokens, they just discard them instantly. At least that's my understanding, and why Zuckuss will work with RAW. Whether or not they FAQ it, that remains to be seen. At this point I'm not sure I can say whether or not it's broken, because Imperial and Rebel faction both have things which go over the top in Epic: Esege, Han Solo crew, Jonus, Tarkin.