I've still not managed to get the wifi card working - another lesson for me about leaving things be when they are working (for info it was all working OK when I received it from Globalscales). Anyways, in the meantime I've started considering another solution. It's a different enough proposition to warrant a separate topic, but just thought I'd link that other topic here because I'd be interested in the thoughts of some of the posters from this topic - TP Link Omada Controller install and run in Openwrt? - Installing and Using OpenWrt - OpenWrt Forum
Best of luck to anyone still fighting to get their wifi working in Mochabin, I'll be interested to see where you get with it.