Not sure why you would go through this effort as the non resistor plugs are still available. May cost a few dollars but you are assured of quality.

The fallacy in your modification is that you may read 0 ohms using the less then 9VDC provided by the multimeter.
you can use any type of metal, but all metals are not equally conductive.
Copper is the most common in non resistor plugs as the NGK BP5EFS, but the best conductor would be silver as in the hard to find Beru/Nology S1K Silverstone plugs

Impress a service voltage of 35KV + and you may find even the slightest gap between conductors can create an internal arc which will degrade the plug.

You can't compare a solid top to bottom electrode with the pieced together electrode you are creating.

Ed A.

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