Getting ZBMINI-L smart switch working with 2-way switch (in the UK)

Hi,

Asked this on askanelectrician, crossposting here to see if anyone knows more.

Can't figure out how to get the ZBMINI-L smart switch working with 2-way switch in the UK with no neutral available (I believe this is called 3-way in the US)

The first image is how the light and switches are wired up, tested with multimeter.

I have purchased a couple of dumb switches and a lamp holder to build a simulation of this so I can attempt to get it working in principle without messing with the actual wiring.

Image 2 shows a working setup with my simulation, but the 2 wires in red would be problematic in the real circuit, as they are not available behind the switch where the smart switch would be going, I'd need to run additional cable in the wall, which would be more disruptive than I want this to be.

Is there any way to do this without running additional wires, or am I SOL, as I suspect?

N.B. I have experience with this model of smart switch, worked first time in another room with a 1-way switch.

https://preview.redd.it/52c7y48xinra1.png?width=1021&format=png&auto=webp&v=enabled&s=eafa3273d26f0902ebd50dc75d7cec266f6d58a6

How wiring is set up today

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https://preview.redd.it/jwedk9kyinra1.png?width=1053&format=png&auto=webp&v=enabled&s=5c3d88a5bb7732642b9325bae91afdad852cd3e6

Working simulation

Submitted by darthfoolish

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