Starting from firmware eWeLink3.5.10, LAN feature is available and can be used for local control without the need to change anything on the device.
A custom component that use the functionality was already developed: SonoffLAN
Would be great to have it integrated in HA.
Simone
I have categorised your post as a feature request. Please vote for for your own request to encourage others to do so as well.
Why not post a PR, or encourage @alexxit to do so?
It’s @AlexxIT code, not mine 
So I did this post to see how the community would react and encourage him to do such step.
Simone