the receiver's Optical Out to the Digital Input 1 or 2 on your DacMagic or Stream Magic.

The Cambridge Audio BT100 is not a standard plug-and-play USB device. It uses a proprietary bus and driver set specific to the Cambridge Audio internal chipset.

A guide on how to cleanly from your existing stack.

a Bluetooth receiver with Optical (Toslink) output.

The most effective "patch" for the BT100 is to stop using the dedicated BT100 port and move to the Digital Inputs. This allows you to use modern receivers that far outperform the original hardware.

If you want a professional-grade look and sound to match your Cambridge stack.

The Hardware Reality: Why You Can’t Just "Patch" a USB Dongle

While it has its own DAC, you can run its Optical/Coaxial out into your DacMagic.

Supports aptX HD and LDAC, which the BT100 lacks. Superior Range: Features an external high-gain antenna.

Here is the definitive guide to alternatives that offer better range, higher fidelity, and modern codec support.