You can try the custom weapon by renaming the diamond sword or netherite sword with an anvil.

This texturepack requires OptiFine, you can download it here.:
https://optifine.net/home
or for Fabric users you need CIT Resewn:
https://modrinth.com/mod/cit-resewn
and Continuity Mod (only for Cit Resewn required this)
https://modrinth.com/mod/continuity

Done.
Bonogakure~