| Well, so far I use the Hide command to toggle the hidden then objects, select those I want, and make them visible.During this procedure, (when only the hidden objects are shown), there could be a popup text shown (HIDDEN OBJECTS) or similar.
 When something is selected and 'un-hidden', then text would dissapear.
 
 alternatively, you could show hidden objects, when pressing H, with a slight hue.
 
 If text, i would be nice as an HUD object, just a floating text in the active viewport.
 This could also work well wih  an isolate command.
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