Smart JUNG Wall Switch AS

I wanted to make my shutters Smart, but I wanted to continue using my old buttons from the JUNG AS series.
The shutters are controlled in the control cabinet via SOnOff 4CH Pro with Tasmota flashed.

In the first step I had thought about using the original button and switching over the 230v wires via 5V or 12v. But I was not advised to do that after a long research on the internet. Then I bought a 433Mhz wireless switch from SOnOff and connected my micro switches to the wireless switches.
Soon I plan to take a SOnOff Mini and connect a PCF8574 IO I2C expansion module to it. Then I don't need batteries anymore, because I can connect it directly to 230V. It's also smaller.