Well there is this tutorial, BUT not sure if it still works with Confluence 5.x (a bit of warning, many of the Confluence plugin tutorials have not been updated recently, and are often incomplete)
If this method still works, you could then convert your user macro to a plugin (just takes the macro code) and add this menu item. You will need this module for your macro code.
I will warn you, there are many steps and details missing from that page (I had to slog through this last week).
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