The paper explains it more as an experimental process than a manufacturing process. Each granule of hiroshimaite captures a "unique" micro-environment. One could imagine an ethical version of this involving conventional explosives in a controlled environment containing a variety of metallic samples of different compositions.

You can probably skip the town in the ingredient list.

There were some nuclear fracking experiments where the nukes cost in the range of a few hundred thousand dollars. It's probably cheaper than you think.

It might be a bit tough getting the permits from the EPA.

Well it appears to be the cheapest method known to produce at least some metal alloys.

It's a real blast, though.

(In all seriousness, I hope we never, ever in this lifetime cause humans to suffer like we did on that day)