netrw and tunneling

Dear Vimmers,
I'm in the situation where I've to remotely administer a server and I would
like to edit the files on my machine via netrw.

I'm already used to "gvim scp://host+path" but in this case the remote server
can be accessed only through one other machine and I've to do a tunnel to edit
them.

I've already tried to add to my .vimrc

let g:netrw_scp_cmd="scp -q -oProxyCommand=\"ssh -W %h:%p tunnel-host\""

but it didn't work. I googled around but seems that this problem never raised.

I'm still on vim 7.4 and I'm using a version of openssh older than 7.3 (this
is why I'm still using ProxyCommand instead of ProxyJump). Unfortunately to
update my linux-box is not an option in the near future.

Any idea?

Thank you
Walter

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