You can't pronounce "QUNCKKK!"?
Not in a way I find convincing. One could simplify it to something like "koonk" or "kwunk," but neither would quite fit. A U after a Q is essentially a consonant rather than a vowel, with the same value as a W, so "QUNCKKK!" is essentially vowelless.
The option I tend toward is to interpret the Q as having an Arabic/Klingon sound, in which case it would be standalone and would free the U to function as a vowel. But that makes the Q a bit tough to pronounce unless you're practiced at Arabic and/or Klingon.