like, I've noticed this in toki pona with people's adaptations of words to fit (C)V(N) syllables. I need you to understand that the sound Japanese uses for epenthesis is [ɯ̟], written as . it's unrounded and more central than most languages' /u/. central vowels are more used for epenthesis afaik.
/a/, /e/, /ə/, /ɨ/ and /i/ are more likely naturalistic candidates for epenthesis. there are certainly use cases for /u/, especially around back or labialized consonants, and ultimately you can use any epenthetic vowel, but you should understand where your assumptions about language come from.
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