Not trying to argue against your point, but most of the Bluetooth latency comes from the codec, not from it being wireless. Bluetooth LE Audio comes with LC3 which supports a codec latency of as little as 2.5 ms.
There is not even a USB-Bluetooth adapter that would enable LE Audio on Linux. (Besides the hacky ones that contain a full Bluetooth stack and present as USB-Audio, but those come with their own problems.)