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I did have an idea, which may or may not work:

It's not a replacement for plated through holes, but may address the same problem.

I was working on a strictly mechanical basis, which meant eyelets or jumper wires

Eyelets have a history of being badly soldered and not being as permanent as people would want.

What I thought of was an automated system that would push a piece of soft copper wire into a hole.

From the bottom it would be center punched to swage it in the hole (and it wouldn't be flush)

Then at the top, cut off a bit above flush, and swaged to cover the top pad as much as possible.

What I'm thinking of is effectively a solid rivet.

While I was thinking of this reply, I thought that a wire protuded through the board, then bent at right angles.

Then at the top, cut off the wire above the surface (distance matters!), then bend the wire over to make a C shaped jumper between top and bottom layers.

The idea is that this could be automated with a special setup that had the appropriate wire benders as needed.

Solder that, and you've got a better solution, I think.

Harvey