12V power supply for Shelly relays with stand-by function and soft-start LED lighting

1.Hello, I need a 12V power supply circuit for Shelly relays with stand-by function. (Such a circuit will surely be useful to many).

To power the Shelly RGBW2 or other models a constant 12V power supply is needed and I don't want the power supplies to run 24 hours. Therefore, I need a smaller 12V power supply to supply all the Shellys and buttons (stand-by) and a second, larger power supply or multiple power supplies to switch on when the load increases. A circuit that will be plugged in between the smaller power supply and the Shelly and will sense either a drop in voltage or an increase in load and switch on the larger power supply.

2 The second topic is soft start lighting. The Shelly has this function but in my dressing room I have lighting on a microwave motion detector and I would need a circuit that will turn on my lighting incrementally for dimmable Led bulbs. For a 12v Led strip there are circuits from AVT and others.

The 3rd topic is to convert an under-counter touch switch to a push button so that the 12v signal is only when touched and not toggled.

In your answers, please state the topic of your statement ( 1. 2. 3. ) so as not to make a mess. .

Thank you.

1 I haven't seen a ready-made solution, but it is quite easy to do using some ESP8266 and an INA219 or INA226 module. There are many descriptions on the web. You could use Tasmot for example. And make a rule that attach the second power supply when a certain current is exceeded.