Converting 2 gang 1 way and 1 gang 1 way switches to 3 gang 2 way

I need to covert 2 gang 1 way and 1 gang 1 way switches to 3 gang 2 way. Switches needs to stay where they are but I can run cables between them. Is anything wrong with doing it as seen in the picture below? I did not include earth cable but both boxes are grounded.

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