Initial

data/custom_item_model_data/function/enable.mcfunction

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+scoreboard players set @s CustomModel 0
+scoreboard players enable @s CustomModel

data/custom_item_model_data/function/init.mcfunction

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+scoreboard objectives add CustomModel trigger
+scoreboard players set @a CustomModel 0
+scoreboard players enable @a CustomModel
+
+function custom_item_model_data:second

data/custom_item_model_data/function/remove_model.mcfunction

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+item modify entity @s weapon.mainhand \
+    {\
+        function:set_components, \
+        components: {\
+            "!minecraft:custom_model_data": {} \
+        }\
+    }
+title @s actionbar [{"text": "Custom Model Data ", "color": "green"},{"text": "removed", "color": "red"}]
+execute at @s run playsound minecraft:entity.villager.work_cartographer player @s ~ ~ ~ 0.6 0.6

data/custom_item_model_data/function/second.mcfunction

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+schedule function custom_item_model_data:second 1s
+
+execute as @a[scores={CustomModel=1}] if items entity @s weapon.mainhand * run function custom_item_model_data:trigger
+execute as @a[scores={CustomModel=2..}] if items entity @s weapon.mainhand * run function custom_item_model_data:remove_model
+
+# resets trigger
+execute as @a run function custom_item_model_data:enable

data/custom_item_model_data/function/set_model.mcfunction

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+$item modify entity @s weapon.mainhand \
+    {\
+        function:set_components, \
+        components: {\
+            "minecraft:custom_model_data": { "strings": [ $(Model) ] } \
+        }\
+    }
+$title @s actionbar [{"text": "Set Custom Model Data to ", "color": "green"},{"text": "$(Model)", "color": "aqua"}]
+execute at @s run playsound minecraft:entity.villager.work_cartographer player @s ~ ~ ~ 0.6 0.6

data/custom_item_model_data/function/trigger.mcfunction

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+execute as @s run data remove storage custom_item_model_data:item_model Model
+execute as @s run data modify storage custom_item_model_data:item_model Model set from entity @s Inventory[{Slot:-106b}].components.minecraft:writable_book_content.pages[0].raw
+execute as @s run function custom_item_model_data:set_model with storage custom_item_model_data:item_model {}
+
+execute as @s run scoreboard players reset @s CustomModel
+scoreboard players set @s CustomModel 0
+scoreboard players enable @a CustomModel

data/minecraft/tags/function/load.json

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+{
+	"values": [
+		"custom_item_model_data:init"
+	]
+}