Please understand, I do not wish to discredit your ideals. Basicly what you are atempting to do is strengthen a quality that is naturaly weak to PLD. There is abosolutly nothing wrong with this. But just like each job and class , everything has a place in battle. A DPS strong pld dose offer an element to a fight, but not one of great value in a party vs boss set up. maybe in a pvp set up can this tatic be of value, but when elements of battle can be controlled simply be each maintaining their role in the fight, it is safe to asume that it best serves the group if one strengthens their indivdual role in that party set up. PLD is un deniably the strongest 1v1 player v boss tank in the game. Highest damage mitigation , strongest enmity hold and great party supporter. Its undeniable weakness, however, is DPS. Naturally weak to the realm of DD , pld makes up for lack of dd by geting great enmity returns off of much less DPS as compaired to its WAR counterpart. This is possable due to non dps enmity multipliers and abilities that retain strong , fast enmity, but dose not deal damage. To try and counter this aspect on PLD, where possable, will take alot of sacrafice in damage mitigation.
That being said, GLD would be the most simple and obvious answer to PVP if you wish to keep your sword and shield, not quite a PLD but requires less sacrifice for higher dps output.