Restore Wimpy Travis Radio
This simple tweak changes Travis back to the way he was before you completed the Confidence Man quest.
Open the console and type:
ResetQuest ms14
set radiodctravisconfident to 0
Alternately, download the file provided on this page, paste it in your Fallout 4 install directory (where Fallout4.exe is) and type this into the console:
bat WimpMyTravis
That should bring back the old Travis from before the quest.