Hm, okay, that looks bad then. I’ve one more suggestion then: Please go to http://www.asio4all.com/ and download/install that driver. It’s similar to our Generic Low Latency driver, it is also a generic ASIO driver.
Stop Dorico, install ASIO4all and restart Dorico. Under Edit > Device Setup in the list of drivers then “ASIO4ALL v2” shall turn up. Choose that and open the device control panel and see if your Bluetooth headphone is showing up.