Batch processing EPUB lossy compression

I was given several hundred EPUB files that are (needlessly) about 2-300MB in size. I find that I can use Calibre's pub editor to effectively compress each book by 80-90% by using lossy compression set to 60 while still remaining fully readable for my needs. However, it is quite tedious to individually:

1. Open each file in the editor;
2. Select "Tools|Compress images losslessly";
3. Select the two "Enable Lossy Compression" checkboxes;;
4. Click OK;
5. Wait for compression to complete;
6. Click Close on the compression results "Action Report" dialog box;
7. Save the new compressed EPUB and close the editor.

Is there a plugin or action that would allow me to automate this so I can batch process all my files in one go?