Quick idea I had in my head, Benchy in the Dummy 13 frame system.
Holds the Benchy in with friction, It can also slide in from the front, too.

Should fit any standard sized Benchy that you have previously printed, No need to print a specially made Benchy.
Replaces the upper torso and head.

Made from the original files of Dummy 13 1.0.
Follow the standard Dummy 13 printing procedures.