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Maybe use a small rebar wire twister with the hook replaced by pliers. Something similar to this

https://m.youtube.com/watch?v=ExFB-mbvt9k

These things need to be fast because it's usually done by piece workers.

There are smaller versions used to tie up sacks also.

Thats a good idea. Ideally I want something that doesn't have to apply much tension on the wires, but a smaller version with the right pitch angle on its internal threads might work.

The traditional(?) version of that tool[1] could also maybe work if you are allowed to make a loop of the wires for twisting. The tool itself is just a hook on a angled axle that rotates in the handle. It's called 'surrauskoukku' in finnish, not sure about the english name

[1] https://www.youtube.com/watch?v=X1BJQorsaCQ

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