Yes @luz, we are working on the same project. I'm using informations taken from this thread and this link. I'm rebuilding a new firmware with modifications on sd.c (like /sza2 wrote in this thread) and 02.network (see the linked link) to enable 2 lans (1 wan, 1 lan) and see what happens.
On very first message you wrote that the address modification (devmem 0x1000003C 32 0x00E001FF) worked for you, but super ugly. It's not working for us, so I asked on this thread more informations on how to make it works for us too.. :)
I'll post my results on this topic when the new firmware will be ready and installed on my omega2s :)
one minor issue might be wifi is turned off at initial install. and then it seems only out of the box configured for IPv6 and not IPv4 which may or may not be an issue for the systems one is using to setup the omega2. additionally, in order to use sd card and/or usb thumb drive there needs to be packages installed before openwrt will recognize them. which without getting IPv4 wifi setup first there is no way get them onboard the omega2. another thing that sucks is most all the openwrt setup guides use ethernet connection for initial setup @ 192.168.1.1, good luck achieving that with the omega2 without a few packages and some trying configuration. yeah, generic 18.06 boots and runs but expect a challenge or two, especially if you have never done an openwrt install before. then again, running through a openwrt install makes you realize what a nice job folks at onion did in the setup processes for the omega2