Run external Photoshop CC script

Yes it can.

A) You must specify where you want to be triggered from Bridge:

- from the Tools > Photoshop menu

- from the right-click mouse button when over a file

- from a folder using the right-click button over a folder in the panel "Folders"

- create your custom panel in Bridge and also a button in it to trigger you code.

- use the "Content" panel to top bar or bottom bar to add a button to trigger your code.

B) Then the second part you need is to use BridgeTalk to communicate between apps (Bridge sending photoshop friendly code to photoshop)

C) The last part is the photoshop code it self (if it need to retrieve some vars from bridge, its a bit more complex, but can be done)