Yato upgrade mechanic in GBA games?

I want to try and incorporate the Yato mechanics from Fates into the GBA games, where there are multiple stages of a sacred weapon. Is there a way to do this that exists?

should certainly be possible, especially considering that at most you just need to make a different weapon for each of the stages, and then replace the weapon with its upgraded stage each time its upgraded.

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Yes, this.
Should be fairly short assembly code to loop through all inventories and the storage to replace all instances of one iitemID with a different one.

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So does it already exist? I have zero asm experience.