At present, in Revit material editor, when you want to switch to a different material appearance asset in types like opaque, metal, transparent, you need to click replace button, browse in asset browser, select an asset.
There are other solution for quick switching materials like below:
Add a simple drop-down button with options in list like: Opaque, Metal, transparent, layered and glazing, or more protein types to list some default appearance asset, how do you think about this idea?