Hi!
1) the video from your link make person who true understand hardware.
We can ask code and hardware details, but it is difficult to do like this (for me).
2) I have not livolo, so I did not know about it.
3) I can use only ready made device and a little upgdrade it software and hardware.
So the tasmota is main information for me.
https://github.com/arendst/Sonoff-Tasmota/blob/development/README.md4) Now you know that simple livolo switch is bad choice because you can not know state of lamp.
So you can upgrade them or buy another device.
5) can you sell livolo and buy something another?