3-Gang Zigbee or WiFi Switch & 3-Channel Tuya Relay for 230V Staircase Control?

Needs help in choosing equipment.

I would like to make a stair switch in the living room according to a diagram like this
.

At the moment I have a stair switch operating one circuit in the same place. I would like to extend it to 3 circuits as shown in the image above.
Can you recommend:

- An on/off switch, zigbee or wifi for three buttons, mains powered
- A compatible relay controlling 3 circuits

Thank you in advance.

Aha -
1. there is no possibility of adding cables.
2. I would like 230V powered switches to avoid batteries

What wires do you have in your contact boxes, how many?

>>21354998 .
I supposedly have five, but I can actually rely on having two - one circuit because the electricians messed something up and one of the switches can only turn the circuit off, but then the other one won't turn it on.

The best way to think of the whole circuit is like this