Sorry I should have read your post more carefully ... A script should not be necessary, just right click the image and select "edit with", typically creating a TIFF Profoto 16 bit etc. This will create a tiff file and open it in Photoshop for editing. Save the file in PS and you will see the edits back in C1. To automate that assign a shortcut key to the "Edit With..." command using your OS. If you use a Mac: the keyboard shortcut from the Apple>System Preferences>Keyboard>Shortcuts then under Applications add Capture One and "Edit With..." and assign your keystrokes. Sorry don't know how on Windows.