How would you spell that sound in a way that is consistently recognized? "zh" is actually one of the more reasonable pinyin digraphs because it follows the sam

How would you spell that sound in a way that is consistently recognized? "zh" is actually one of the more reasonable pinyin digraphs because it follows the same pattern as "sh". If "s" + "h" results in [ʃ], then logically "z" + "h" should result in [ʒ]. "c" is used the way pinyin uses it in many languages (e.g. pretty much all Slavic ones that use the Latin alphabet, for starters). "x" and "q" are more questionable, but there's precedent for either in languages using Latin-based alphabets - "x" can be [ʃ] in Spanish, for example, and "q" is [c͡ç] in Albanian.