My plan and recommendation to everyone regarding epic ingredients is to simply use the same level 15 toon you use for non epic ingredients.
Spend a little time farming all the non epic you want/need. You can stockpile a lot really quick, concentrating largely on the sub 15 ingredients. Then level to 20 and farm epic challenges. This has a lot of advantage as you already have the character set up and provides the opportunity to seriously strengthen it.
Taking the toon to 20 allows an easy shroud crafting. While running epics on the level 20 you can still run run the higher level ingredients as well. Farm epic tokens for hearts of wood and epic ingredients while putting in 20 shroud completions for an essence of cleansing.
Once you're ready, you can TR back into your level 15/16 toon and take the monk past life to increase your unarmed damage.