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There are options but not necessarily what you want. Anodization is a process to protect aluminum from degrading due to “corrosion “ from atmospheric conditions.
It is universally accepted even in architectural aluminum. In essence it converts the pure surface by a multi step treatment. Good that you asked before diving off that bridge and damaging the wheels but suspect you can better understand the process by doing online search of the process.
If you have wheels that are polished they don’t have protection and thereby need regular maintenance ( polishing) to stay nice..
Porsche wanted durability but also maintaining the satin appearance which was in the early days the look they were after.