Already tested it. I copied all the data from one of my characters to a level one (Except gearlist.dat or something like that... Because maybe that one would be dangerous, the char didn't have gearlist unlocked yet...)

And it worked!... Copied not only my HUD options but also the character configuration... Even the skills and secondary tabs, everything!... So if you want to try new character but it's annoying to config that...

Just copy paste data from one folder to another (But ensuring backup always)

PS: Thanks OP for the idea.