While I understand there may be mixed opinions about how the execution of this request would be engaged and that it may be somewhat of a pipe dream, I must go forward in expressing the desire most of my raiders in my guild and friends list have towards this request. So, I'll just come right out and ask it.
We've already seen the SPvP System and Gear window via the SPvP Build Window so lets utilize what systems we already do have and put them towards raids where gear can make or break a team. Let's take a look at this SPvP Build Window in case you aren't familiar with it quite yet. Here
Let's say you want to test some build or try a gear-set or whatever to use in the raids, but you don't have access or time to go get ascended trinkets or want to waste time. So you go to this area in the SFTA Here and stand then you get placed under an instance duration effect of the Exo-Suit Outfit appearance for the duration of your build+gear testing.
When the effect of the appearance takes effect you have an interface similar to the SPvP window shown earlier in the post, allowing you to select any weapon and armor type your current class is able to use along with any sigil and or rune depending on the slot you select as well as the ability to convert the armor or weapons to ascended status. You cannot view this window/change unless you are in the area I'm placed on the last screenshot.
While I realize that having the access of testing all of these builds would kind of eliminate the reason to purchase such items for the testing purpose I suggest adding a currency sink much like the Structured PvP system does for unlocking specific Runes/Sigils/Amulets. Should keep things in line.
Upon leaving the instance/logging out ALL Generated items/stats/gear is wiped from the inventory and off of the character. Test gear can not be placed in bank/inventory/shared item slots nor can it be listed on the trade post...
All of this being said, I do realize that it is a pipe dream but I believe the tools and systems are there in place that we can recycle and use for the benefit of the community based on seeing the systems in SPvP already in place and the Beta Gear Loot Boxes.
Please think realistically and for the community...So... Suit Up!