I have become aware of a new solution for getting shared audio to work on Windows.
It’s a driver called FlexASIO (GitHub - dechamps/FlexASIO: A flexible universal ASIO driver that uses the PortAudio sound I/O library. Supports WASAPI (shared and exclusive), KS, DirectSound and MME.)
Unlike ASIO4ALL, it defaults to DirectSound output.
On my system it works great… no noticeable added latency, and all my other Windows audio continues to work just fine with Dorico open.
This is even better than the old (RIP) “release audio device in background” option.