I realised that there was no sleek cable tidy for the UK, three-prong cable for the Steam Deck OLED, and thus this was born. 

I modelled the plug (included stl in case anyone wants to play with it) and am relatively happy with the end result. It isn't the most elegant solution, but better than just shoving it into the recess. 

I printed the winding fork separately to print it in a stronger orientation and remove the need to print unnecessary overhangs, then stuck it in with a drop of superglue, though it's a tight fit and probably wouldn't budge either way.