I assume you’ve tried to contact both CA and Apple? Are you able to update software on the Cambridge?
I would get a Wiim streamer/DAC . It is compatible with many streaming sources, such as Qobuz, so you wouldn’t have to Bluetooth. It also offers AirPlay, which is a definite step up the ladder from Bluetooth. They have many models at different budget price points
Wiim will stream to BT headphones, I am not sure about BT DACs. However for $400 you could pick up a Wiim and a BT headphone

