I dont know if you can batch import inside Vue, but you can replace all the lo-res image files in the export folder with hi-res images...just make sure the new textures are the same format (replace JPG with JPG, or PNG with PNG) and named exactly the same. Then when you open the Vue file or open using the Python script, the textures will be changed.
Edit: Make sure you COPY, not Drag and Drop your hi-res files into the export folder, or you will lose your original hi-res textures