Importance of mass/count/group nouns

Merhaba!

I'm working on my loglang again, and I've decided to use distinctive grammatical
vocalic length, tone, and nasality. I've decided that mass nouns are the
default, count nouns have their first vowel made nasal, and group nouns have
their first vowel made nasal and long. Are these types of nouns important
enough for this, or do they just be formed from additional particles? (I'm
thinking that important things like transitivity should be marked by vowel
modification, but I'm not sure if these types of nouns should get this
treatment.)

--Trebor