IMHO, the best approach is either to fork the Plugin to maintain your changes, or else submit patches to the Plugin developer, to have your changes made a part of the original Plugin.
Creating a “Child Plugin” really isn’t easy. The “Child Theme” concept really applies to the template files that get used, moreso than the Theme functions (and in fact, the functions.php file from both Parent and Child get loaded, which does cause problems for improperly coded functions.php files in either the Child or Parent Theme).
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