Using aptx codec for bluetooth

You would need a Bluetooth transmitter that also supports apt-x. Very few integrated BT transmitters will include this, since it is extra cost for the manufacturer (software license) and also forces them to use silicon made by the company that license apt-x (Qualcomm CSR). Some of the Bluetooth transmitters that can be bought for sending audio from any device to suitable head[phones do include apt-x - you just need to look at the specs when buying (there are a few on Amazon for example). Note that for any media players that include Bluetooth transmit capability, the selection of the audio codec used is not normally down to the software in the sending device - it simply negotiates with the receiver and they choose the best system that they both understand.

OK - I understand now. It was not clear from your earlier message that you had much knowledge on the Bluetooth side - also, you did not even mention any of your hardware - hence my rather generic answer. To be honest, I have no knowledge on my side about how Kodi or LE talks to Bluetooth dongles. I would expect there is a way to make it work as you would like it to, but that's outside my own expertise. You clearly already know more about it than I do. Sorry I can't help.