Hi,
have you consider to add adamantium? because its an alloy (more usages for your dusts), and it can create weapons almost indestructible (using by default Unbreaking III enchantment maybe?) but with extremely low enchantability (none or almost none). Maybe more other uses, like decorative very hard blocks, better encasing for furnaces, etc..
It's common knowledge that one of the component is a metal from some meteors.. so The End maybe? or extremely rare ore in overworld (meteor one) as one of the components.
Maybe you can override the Nano-Sable with that, because its "unbreakable"