As of version 3.0.8, Mystical Agriculture allows you easily add your own Reprocessor Crafting recipes using CraftTweaker. Here's how you do it.
Adding a recipe
mods.mysticalagriculture.ReprocessorCrafting.addRecipe(name, <output>, <input>);
name: A unique name for this recipe. Must be all lower case and have no spaces.
output: The output item for this recipe.
input: The item that is required to make the output.
mods.mysticalagriculture.ReprocessorCrafting.addRecipe("test", <tag:forge:ingots/iron>, <item:minecraft:apple>, <tag:forge:ingots/gold>);
output: The item to remove all recipes for.