When using the IPA, there are a couple of completing standards for
translating to ascii. Best to get agreement as to which one to use. For example, SAMPA uses the @ character for the mid-center schwa.
Oh... You are asking about transliterating to tlhIngan Hol. I'd use the same system that is used to break up foriegn consonant clusters, the
Iwith a glottal stop before or after it to shorten/diminish the vowel. Worf ->
wor'Iv Of course of some words that won't work, and the best think you can do is just what you suggested, promote the vowel to the shortest legal vowel, the
I.
[Cleaned up links and spelling -Klythe]