Curran Riley commented
The University of Wisconsin system agrees with this idea. We use APIs to load and sometimes alter patron data. One example is replacing legal names with preferred names (Alma does not yet have fields dedicated to preferred names).
When we replace a legal name with a preferred name, we'd like to add a note specific to this scenario that indicates a name has been changed and includes the legal name. The legal name will then still be in the Alma patron record and can be used for verification, the collection of fines and fees, etc.
We'd like to have a note type that is reserved for this purpose, and that means we want to create our own note types to avoid collisions with other library staff use. We have asked for different barcode types in the past, and had them added, and this seems like it could be solved in a similar manner.