Connect old toggle switch to new Tuya smart switch - Projects

Hi, I’m currently remodeling my house. The dining room has been wallpapered, and I want to quickly connect the light switch when I notice that the two-way switch no longer works as usual. A Tuya button and changeover switch, how do I get them together if I can no longer get to the junction box. So I thought about building a circuit that would allow me to do this. That’s basically the electrics. What do I need: Power supply 220v to 5V, optocoupler 220v to 5V, bistable relay

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