I would also point out that as the mouth transitions from an unvoiced uvular affricate to a vowel, it will pass through a velar or even palatal approximant.  In other words, as the mouth moves from the shape of a {Q} to the shape of one of the vowels, it passes through an /r/ shape.  Notice that the non-existent "r" is only heard when the {Q} is followed by a vowel and not when it is final.

Can you elaborate on this? When I pronounce Q and then a vowel, my mouth does not pass through what I think of as an r shape. Do you mean like the French guttural r?

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SuStel
http://trimboli.name