Share connection from Eddie to USB

[PommePatate 1]

Hi,

 

I'm connected via Ethernet (en3) and I'm trying to share my OpenVPN connection from Eddie (utun0) to my Nintendo Switch connected via USB (en4) on OS X 10.11.

Any idea on how I could achieve that? I tried using IceFloor with no success.
And unfortunately utun0 isn't listed in the OS X network tab so I can't use Apple native way to forward the traffic. If I share en3 it bypasses Eddie completely.

 

I hope it's not a dead end.