This would also be advantageous for any and all existing vehicles that have multiple skins available such as civilian cars and SUVs.
Personally I don't think this functionality warrants the addition of a new dedicated Zeus module, I suggest this solution above for the sake of argument. Simply added a slider UI that cycles through all available colour or texture variants of the selected vehicle to the "double click" menu would be the most elegant solution.
Bonus: If this feature were implemented then the ability to add custom textures to the lists available for each vehicle would also be a great addition.