The only way I can see to whore more agility off your melee weapons is in fact to use Stanchion of Primal Instinct with +25 agility giving 100 agility, not sure its worth being lynched by every druid in the raid and getting dirty looks from all the other ones you see about for the rest of time though!

Edit: also 2x Blade of Infamy with +20 agility gives you 96 total agility, thats probably the best combination availible right now