giasou Csideris ,
It looks like you have an active wife,
Now more good and bad news.
In the past , on other vehicles, I found the plastic trim too much bother to try and remove so I have masked the door panel and used an acrylic spray paint to refurbish the trim.
Down here we have touch up paint to suit the exterior of most new cars, so there is plenty of selection.
I use a lot of Greek made auto paint so my guess is you will find something suitable.
Now to get the plastic off your i30 door... at this stage no guarantee.
But, I will be stripping a GD door later this week so I will let you know your best option(s).