Easy way to edit object thumbnails in cities skylines?

Does anyone know an easy way to change workshop objects' default thumbnail icons in cities skylines?
I love the game but I am fed up searching the right object in a panel containing a dozend or more of the ugly white-bricked default icons because the modders forgot to create one for their objects. I figured out that I can load an object into the asset editor and add an icon/thumbnail and then save the object as a new (personal/private?) object and delete the original afterwards - but I don't think that is a good approach (I will have to Provide Updates myself...?)
I wonder if there is a better and easy way to get at least a minimum of comfort back by change / add a thumbnail for the objects that are missing one?
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Cities Skylines: Asset Editor Tutorial (How To \u0026 Guide)
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