There's a great number of way to do this, I believe. My group has a style that we've place in a commonly used library. All that is needed to access it is to change the ODS PATH to include it. Assuming this is a permanent customization to their SAS working environment. This path could be automated in AUTOEXEC.SAS.
I haven't tried it but might it be possible to include a folder as a secondary level of the SASUSER directory in the configurations files. You may not need the path statement in this case, check to see if you do, but you would also not need to add a libname just for this set of style templates.
I don't think copying is necessary. ODS searches for style catalogs in the path, and the LIBNAME engine concatenates your computer's folders and also concatenates the catalogs inside of those folders.
I hope this is a start. I'm not an expert, but I have this experience of adding a style catalog to my ODS path.
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