Add extra features in import images as plane to ease motion design workflow

Since the xcf import doesn't support the latest gimp format, I've switched to the bundled addon for importing image as plane (+ export layer addon of gimp) but I've been missing the automatic positioning of layers according to their position within the original image.

So, I've been patching the io_import_images_as_planes addon to allow using an offset in the filename (in the form "image+X+Y.png") to recover the same features are the xcf importer.

Furthermore, I've been in need of a free to use transparency node when importing plane so that their opacity can be easily animated.

Is there an easier way to import an image and keep the layout in gimp ? Is there an easier way to animate the opacity of imported images ?

The patch for 2.80 is there: gitlab.com/snippets/1901073 I'm willing to polish it if there is any interest in integrating it in the official addon but I'd need guidance to do so.

Thanks in advance for your feedback.