I updated the 818 and MS600s, decided it was easiest to bring out the Sooloos gear and a lot of wires and let it do it automatically, rather than researching. Worked great.

But without updating the speakers it doesn't change things.

Read the thread about adapter cabling. I'm constitutionally disinclined to solder. But I found an RJ45 to USB adapter on Amazon, ordered one, we will see if it works:
USB 3.0 to RJ45 10/100/1000 Gigabit Ethernet Adapter

Music room: 818v3, DSP8000SE, Roon/Intel NUC, microRendu/LPS-1 into Geek Pulse Xfi into Audeze LCD-3
HT: G61R, HD621, MS600, Oppo, Avantgarde Solo
Library: MS600, Bel Canto, Mark & Daniel
Other: SonicOrbiter, GeekOut, Audeze EL-8