HE HE HE...

take this code and do whatever you want with it
I used: https://minecraft.tools/en/spawn.php to generate the required nbt data.
use loot table: "stick" to remove original loot when replacing

command:

execute at @e[​type=CreatureName] run data merge entity @e[​distance=..0,limit=1,sort=nearest] {GeneratedNBTDataFromMCTools}