Since T4 gear is already in game:
https://henryxconan.wordpress.com/20...in-comparison/
How about adding T4 gear as "prestige gear" aka T4 will have exacly same stats as T3 but will have different color/looks.
Getting this gear would require to have certain achevements (like hitting pvp lvl 10). In other words prestige gear would be for vanity only and aimed at long capped veterans with nothing left to do pvp wise.