As I learned the names, qamats hatuf is your qamats qatan, and qamats with sheva next to it is called hataf qamats. Hataf qamats is also the official Unicode name.
If the Masoretes considered qamats to be an O vowel as you say, how come furtive patah is never written after qamats, or patah, although it is written after every other vowel including holam? I am not really questioning what you say, merely asking for qualification. More like qamats was a back open vowel, perhaps rounded, a bit like the Scandinavian a with ring, or Persian long a - something between "ah" and "aw" in my English.
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