I am essentially asking for how to set something up for 1.16.5 where I have two items with two different models and textures, I want to make something that has the ability to turn from one to the other, sort of like a lightsaber where the hilt has no properties and attack damage, but will save the properties of the fully extended sword which does have the attack damage and durability.  I want to make it so they still are two different items but retain enchantments of each other when switching between.  
How would I do this?  I have a snippet of what I want to do but no idea how to implement it.

package com.pokeforce.dragonsjourneymod.common.material;

import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.world.World;

public class SwordTransform extends Item {
    public SwordTransform(Properties properties) {
        super(properties);
    }

    public boolean onItemUse(ItemStack is, PlayerEntity player, World world, int par4, int par5, int par6, int par7,
            float par8, float par9, float par10) {
        if (player.isDiscrete()) {
            ItemModelProperties.
        } else {
            // code if right clicking
        }
    }
}

Edited May 26, 20223 yr by PokeforceGames

an ItemProperty?

https://forge.gemwire.uk/wiki/Item_Properties