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Sure! I used the script and schematic on this (german) page:

https://translate.google.com/translate?sl=de&tl=en&u=https%3A%2F%2Falexbloggt.com%2Fraspberry-pi-ausschalter%2F

I have the same power supply here (DC/DC converter on 3D-printer PSU). To shutdown the PI (model 3 B) I press the button and wait for the green activity light to become always on. Then I can switch off the printer.