Hold your horses!
I've done this without any dissassembling or cutting. I used a plastic pipe (in Swedish "VP-rör"). There are two types of VP, standard and flex. Unfortunately I couldn't use the standard one as I had to hide the hole on the other side 20 cm to the side.
I drilled one 16 mm hole behind the wall charger and one on the other side of the wall (behind the refridgerator in the kitchen). Then I managed to insert a steel wire through the wall and then I could place the plastic pipe in the wall. I removed the power cable from the wall charger and inserted the cable from the other side by dragging it with the wire.
Maybe they've changed the wall charger, but one mine the power cable is attached with a plastic jack. This jack will fit in the 16 mm pipe. All is then hidden by the wall charger itself.
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