Not without holes left in the door which won't be pretty.
If you leave the handle offset it will strain and rip off, leaving even bigger gaping holes or a ripped apart door handle.
Then you have the problem that the template to mount the brackets to fix the door will be for a 45cm door, not a 50cm door, so they won't work either.
And anyway, most 45cm integrated dishwashers are a shade under 45cm wide to take a 45cm door on them. I think your thinking on the original introduction of the freestanding 45cm which was indeed designed to fir into one half of a 1000mm sink base unit.
But I checked some instructions it's a 45cm door on them so far as I can see.
Basically, it won't work well. Doable, but inadvisable.