If BMD is installed locally, utilize a tiny RPA agent such as pyautogui, Auto Hotkey, or UiPath to automate clicks and inputs. The flow may then be connected by triggering those scripts using n8n webhooks.
If it's on a distant server, run the same script or bot and access it over HTTP from n8n.

To set up, go from n8n to webhook, then to RPA script, and last to BMD action.