I haven't tried it yet, but "full Unicode support" is accepted as a feature request and will probably be implemented "soon". See https://community.ubnt.com/t5.... If you want, I can try it out tonight.

Well, all wifi-enabled devices in the household are Apple devices or can be configured with Apple devices, which makes the other end devices uninteresting for me. Especially since an emoji is already used as the SSID on the time capsule. Everything else is connected directly to the network via LAN (printer, etc.).