Are there secure alternatives to WPS still retaining the same usability?
There is DPP in WPA3 but not sure how effective it is.
WPS is generally used in home environments where the customer has direct access to the router and can push the button to start the pairing process. There aren't any plans to support WPS on the Firebox devices.
At this point in time, none of our devices support WPA3. We do have the following feature requests open to support them at a later date:
Firebox Integrated Wireless - FBX-10665
WatchGuard APs - AP-411
WatchGuard Customer Support