The EA6350v3 is fully supported. In fact, it's one of the most recommended devices since Escalion and I added support for it at the beginning of the year.
Still, it's facing the same VLAN issues as all of the IPQ401x regarding to VLAN in LuCI and the inability to use vlans 1 and 2, which are indeed forced by the driver.
In the sake of completeness, I added a couple of patches (not mine, patches from Christian Lampeter) which never reached upstream and by what other users of my build told me, it works fine using those patches.
The problem is that it requires a custom kernel and a custom network detection script, both such things can only be done by building an image itself.
I won't self publicity myself anymore as I have a hater which is really noisy. I would recommend to try the default OpenWrt first and then try the build to compare results.
Edit: to be clear, my sole purpose is to give OpenWrt users options to choose!