No there’s definitely a duelers guild tabard. It’s black and gold. I’m not positive about the title however. Look under your apperances “Dueler’s Tabard.” its from a duelers guild achievement that nobody will have because nobody queues up.
Edit: Title “Contender” for the achievement “Master of Duels” which is just for completing other achievements.
I’m just saying there are rewards. Everything else you’ve mentioned is spot on. It’s a poor system that’s not advertised at all and nobody uses. The first and last time I heard about it was randomly tuning into Pshero during alpha or beta.