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To be honest, no I don't believe that diminutive is avoidable. If you have a name with an obvious nickname\diminutive, chances are that some people will say it instead of the full name.
I on the other hand prefer Josh by itself even though I am completely fine with Joshua. If I were to use the name for a son, I would do just Josh, but that's me.

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Joshua as a middle name. The nn may be more avoidable that way.