Can i ask why this is? Isn't the UAD interface Thunderbolt? Or is it an add-in DSP card that connects via Eth?
You may want to look into this abit more, i don't think it'll work as i tried using a TB2->TB3 Apple adapter and the Thunderbolt header would disable itself. Maybe it was just my model adapter that was old and not compatible? Maybe my board just doesn't like the adapters? Can't say.. What i can say is i've read somewhere online that a user daisy chained like that and got their hardware working, but i think this is hit and miss.
What should work is a TB/USBC -> Ethernet adapter, but i'm assuming this will require the Thunderbolt Bus to be active in macOS (i know it shows up in Big Sur, not Monterey). Maybe it will work in Monterey/Ventura without showing up in Thunderbolt/USB4? Someone else will need to confirm this though.
@bonfilio124 i think is using a TB->Eth setup from what i read in his Raptor Lake build.