retracted tongue root as consonant?



Does any script (including invented phonetic scripts that are not
natively used for a natural language) treat a retracted tongue root as
a consonant (perhaps an approximant) with its own grapheme?

For example, in such a script, <bulky> might conceivably be spelt as
[br"#kI] with [r"] being a vowel represented by a ramshorn in IPA and
[#] being a "retracted tongue root approximant".
.


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