As a full time Ritualist, I'm a proud member of the classes that don't get to go into DoA, rather since the Ursan nerf (Which was greatly needed) I can no longer enter into this zone.
Now, before you jump to conclusions I'm an antisocial lock-in that wants a free pass to nice things hear me out.
Pre-Ursan -> if you spammed for a group as an R8 lb Rit wanna guess how many groups wanted you? take a guess, its less than 1.
Ursan Age-> if you spammed for a group as a R8lb R10 Ursan, took about 2-3 minutes to find a full party with monks. No one judged you based on your class, rather your titles were a bigger facet of it.
Post-Ursan == Pre-Ursan --> Ursan needed the nerf it hurt the game a lot more than it helped in a lot of places except places like DoA. You know what I mean, places that are exclusively dominated by the trinity builds. Not a Trap\Barrage ranger, OB tank, Monk, Ele? Too bad. It is an extremely good build but it is the only option for a PuG in DoA.
Also, look at Destroyer weapons, every facet of them is purchasable, its a bit of a walk to get to the seller but other than that still a monetary issue more than a skill issue to claim them.
please allow the Gemstones needed to make the armbrace be contained in the rare-material merchant or even go to the extent of having a single gemstone trader in the DoA staging ground.
As far as economy would go this would open up some new avenues of money for those out to turn a profit as well.
Pro: Now people will need runs through a zone of DoA in order to create the armbrace[s]. Full team runs would likely be the only option therefore opening a huge market to do so.
Con: Easily outweighed by the Pro, the cost of the gemstones will stabilize and drop as more and more enter and leave the market. Like any other rare material the price will drop, the difference with these though is that there is a substantial hurdle to turn them in. Unless you want to gamble with the coffer

Just my two cents, please keep the comments constructive.