I decided to take my laptop to the local electronics-shop. I get it back later today. They said that it's possible to take the original momentary switch away from the chip, solder new wires to chip, and solder original switch back to the end of wire.
That sounded great, because now I can use original cover from laptop, for my car's dashboard-mod. That's the way how I also get cool green led for my powerbutton
Hopefully they can do it without breaking anything. Guy in a shop said, that it could be hard if the original switch is glued to the chip.