Game can be played on your own server now. So it probably is possible to use cheats on your own server. Idk yet I haven't tried it myself but I have seen people on YouTube modding fallout 76 on there own vip server.
There will be no trainers made for FO76. Even if its on Private server! You are connected online to their servers where the info will be held!
But you don't understand. Using mods works. On your own server only. I will not say it again. Next time read my comments