Is there a way to write the Greek word τρίζω using Western characters?

For Modern Greek, it depends on your favour of Greeklish:

• trizw is the usual ad-hoc online transliteration, using w for omega.
• trizo is the phonetic transliteration
• tpizw is a variant transliteration (used by my friend and co-author George Baloglou), which emphasises visual similarity more than phonetic.