Back to the original question, if you simply want sorting on authors last name then you should not need to use a plugboard. Instead all you should need to do is Customize the PRS-T1 Device Interface driver and check the box to use author_sort for the author field on the PRS-T1 (assuming that your Author Sort field is set up in Calibre to be lastname, firstname).
Plugboards come into their own when you want to do fancier things like get the Series name and/or index included in the Title that is displayed or want something in the author field that is more than one of the standard Calibre author/author_sort fields.
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