I think you should further investigate the hard wired option using switches that support stp. STP was recently discussed in another thread and a number of switches and topologies were mentioned - one switch iirc was under $40.

My understanding of stp is that you only need one switch that supports stp to break the multi route circular issue that causes the network storm. I may be wrong but if this is the case then a new switch may be a cheap option.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).