In the Baseball Canada rules, there is a provision in the book that suggests this could be called a balk.
8.05 If there is a runner or runners, it is a balk when-
(h) The pitcher unnecessarily delays the game.
In my opinion, setiing up as a left hander is an unnecessary delay unless the pitcher can show me that he will at some time throw as a southpaw. If he can't demonstrate to me that he has intentions to make a pitch as a leftie, he's slowing my game down and I'll call him on it.
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