I've just got the RX-666 working in SDR Console. Still a lot to do though.
Here it's running with an amazing 32MHz bandwidth, when the video recorder is not started the CPU load on a i5-8600k is roughly 10% with the heavy FFT work performed on a NVIDIA (CUDA) GTX 1650 Super.
After talking on QO-100 with Mike, G0MJW i've ordered a LibreSDR from AliExpress where it's known as "SDR AD9363 AD9361 ZYNQ7020 ADI Pluto communication experiment platform".