Hacking cheap smart switches to work off grid (12 volts)?

I bought a bunch of cheap smart switches over the last few weeks and was wondering if anyone has managed to get these to work on a 12 volt dc system rather than the 100-265v ac system they are designed for?

Or, if there is one, can point me in the direction of a tutorial that might shed some light on this idea?

The router I have is a 9 volt in and the LED lights i have are already hacked or designed to run at 12v.

The "brains" of the switches appear to have a 3.3 vdc input so I think it shouldn't be too hard, right?

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