I'm hoping this gets ported soon myself, but alas I have no knowledge of Visual C.
I was thinking it might help a bit if you could tell us all what would be needed to make a plug.
Like are you wanting the plug to import all data during runtime, or would it have all images imported as sprites beforehand?
I know the tool outputs everything to an xml, and images to a folder, but Construct is not set up to create completely new objects, so there has to be either a dummy to load to, or a way to simplify the rigging set up.
Not sure a plug can do that easily.