I think Plutarch connected Osiris to Canopus, but the suggestion you make that the identification of Orion with Horus was a linguistic mix up is interesting, i've come across similar suggestions regarding Bootes being refered to as Orion by Hesychios;
Hesychios, of about A.D. 370, called it Orion, but this seems unintelligible unless originating from a misunderstanding of Homer's lines, translated by Lord Derby:
Arctos call'd the Wain, who wheels on high
His circling course, and on Orion waits,
as if they were in close proximity. Or the title may come from some confusion with the Orus, or Horus, of the Egyptians, that was associated with both Orion and Bootes. La Lande alluded to this when he wrote:
Arctouros ou l'Orus voisin de 1'Ourse, pour le distinguer de la constellation meridionale d'Orion;
and, in considering this very different derivation of our word Arcturus, it should be remembered that Kandaus; and Kandaon were the titles also applied to Bootes, as the latter Greek word was to Orion by the Boeotians. It would be interesting to know more of this connection.
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Morph.