rkw
Headphoneus Supremus
There are LDAC transmitters now:What you are looking for is not a receiver, but a transmitter. Unfortunately there just isn't any particularly good BT transmitter around. Most that I have seen are really designed for adding Bluetooth capability to TV, and limited to aptX or aptX-HD. There is really nothing on LDAC transmitter that I know of.
https://moisescardona.me/hidizs-ap80-usb-ldac-bluetooth-transmitter/
Shanling M0, M2X, M5S