Using the IKEA Duktig toy stove top with a power adapter

Recently I was approached by a younger user of the Duktig toy kitchen. It includes a battery powered stove top which seems to chew through batteries (6x AAA) like mad. There is a replacement PCB available that cuts down the power usage, but unfortunately it costs quite a bit when imported to Germany.
So I decided to go with an easier route and power the toy kitchen from a power adaptor („wall wart“). I wanted to share what I find to work pretty well: