for people who came in late and wondering why Epic doesn’t support this device, here’s the plugin I’ve been maintaining for over 2 years now: -SpaceMouse and here it is on marketplace: SpaceMouse for Unreal Engine in Code Plugins - UE Marketplace
I’m not Epic but I hope an open-source plugin will do
P.S.: Epic did support actively the development of my plugin and they’re also in close contact with 3DConnexion and help them with their plugin.