I don't see any converting materials except rare to legendariesNeph -> DB Farm -> Collect all White / Blue / Yellow -> Trinity Conf -> Convert Crafting Materials.
I use the Quetzacoatl speedfarm build list in my signature for materials. Use it on rifts. Pick difficulty based on locust swarm kill time. Max out the difficulty to where you are insta-killing trash and only have to stop zerging for elites.
Also: Please get the latest Trinity in the Plugin section.
If has a CRAFT MATERIAL CONVERTER built in.
No more worries about getting more of a particular one. It will balance them for you.