Can add-on gramplets use the Lib plugin type to supersede built-ins?

The following quote from the PR#1721 comments describes the changes:

This is an enhanced version of the Filter gramplet. The enhancements are:

  1. The elapsed time is displayed.
  2. A new ‘Define filter’ button that opens a filter editor dialog and automatically populates it with the rules that correspond to values given in the gramplet.
  3. The person filter has two new fields: Birth place and Death place
  4. The default confidence value in the Citation filter is ‘Very low’.
  5. Place filter: An error message is displayed if the user fills in the ‘Within’ value but no place is active
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