Scratch

I am making a program in Scratch that transliterates peoples' names into Japanese. I need to tell the program that it does not need to add a U after a consonant if the next letter matches one of the items from a list. (Are you confused now?)

Basically, I have a list that contains all of the English vowels. I need a block that is just like this:
  <{ Item (Any) of (Vowels)  }>
except that by "any", it means ALL of the items in the list. That way I can tell the program that if a list item does not match any of the items in the Vowels list, it has to insert a U.

Is there another way I can do this without making my scripts REALLY huge?