Odyssey X864105 as Access Point

I have an Odyssey X864105 running openwrt as a router/modem and wanted to add a wifi access point to it. The built-in card seems to not support using it as an access point. (e.g. Odyssey Wifi problems - Cannot setup a 5 GHz access point (but 2.4 GHz works) [ODYSSEY-X86J4105] )

I thought I’d be able to buy a B key wifi card similar to the B key 5G/LTE cards but haven’t found any. Has anyone managed to figure out a good way of using the Odyssey as a wifi access point?

B key only have USB2.0 on board, the best way is use a fat AP.