For those who don’t mind compiling the plugin on their own, be sure to check out: https://.com//
Latest version (which only compiles for UE 4.18 right now - will have to fix that later) has support for 3Dconnexion V3D commands. I mapped them to UE4 editor’s Fit, Top, Left, etc. viewport functions. However, it does require editing the XML file that 3Dconnexion generates for the UE4 editor (check your Roaming/3dconnexion/cfg directory in your appdata directory - yeah, it’s kind of involved). The xml file needs to have the entries shown in this post added:
https://www.3dconnexion.com/forum/viewtopic.php?p=53563&sid=f8b61888bbbac2608a84381c5de668a0#p53563
This is experimental right now - I am not sure if the way I access UE4 editor commands is proper.