How to remove vanilla recipes [Please Reply]

It says "Crafting recipe needs to have result defined (air does not count)" when I try to use air to remove a wooden pickaxe recipe, since my new type of planks have a more complex pickaxe recipe and I don't want the players to cheese the more complex recipe by using the vanilla wooden pickaxe recipe. However, I can't remove the "planks" tag since I want this wood to work with literally anything else. My wood also has a unique pickaxe. Every other pickaxe recipe (Oak, Birch, etc.) can stay in the game.