I have all these same plug-ins in my Plug-Ins folder in .gimp-2.8 You mentioned that you had them in a .py folder, did you mean your plug-in?
RobA post below
If you have resynthesizer grab my Resynth along path script below in attachments.
Create a path (multiple sections OK) then run the script by right-clicking on the path and selecting "Resynth Along Path..."
The first parameter is the width of "stroke" and the second is the bordering region to sample for source texture.
I've tested it by creating a path, stroking it with a line on an image, then running the script against the same path. It should also respect selections limiting the path.
-Rob A>