I have been eyeing the Pine64 PADI, but I haven't bought any yet to try out.
It would be really hard to "clone" a SOC. Since its not a board that you can print for a buck these days, it actually requires a fab to print chips ... which is not something that is common to open source yet.
Oh I guess I didn't mean "clone" literally. Just an as-or-more-easy-to-use WiFi SOC.