It's just a bit strange how it works, it's needed to:
-Install app, reboot once
-Launch app, go to upper left (notifications) and "enable"
-Go again to notifications and "Stop app" (or "disable" is proposed)
-Then you'll see upper right "wired network" icon changing to wifi icon!
At this point every app I tested requesting wifi are working with no problem over ethernet...
You can switch again on-the-fly to ethernet/wifi by enabling/disabling through notification.
A bit laborious and looks more like a proof-of-concept but it works! Still to improve though

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