are afraid they'll mess up the spelling of."
Three quick comments on spelling and pronounciation from a Jew
First of all, it's spelled חֲנֻכָּה but in English, it is (Ch or H)a(one n or two ns)u(one k or two ks)(a or ah) This gives 16 different possibilities and I've seen at least half of them. Even the Israeli embassy in Washington, DC isn't consistent. Hannukah and Chanukah are among the most common...
Secondly, in any word from Hebrew or Yiddish, if there is a Ch, it is *never* pronounced like Ch in Cheese (That's why Michelle Bachmann got all of the press for pronouncing Chutzpah incorrectly). Instead, it is aspirated 'H', if you've ever seen Germans in the movies saying "Ach Du Liber", take the sound at the end of the first word and turn down the flem to barely noticeable. If you can't do that, just use 'H'.
Thirdly, There is a t-shirt out this year with Han Solo holding a Memorah that says "Keep the Han in Hanukkah". I love it.