Re: Rear window plastic moulding.
Looking at the parts catalogue, I don't see that piece as having a separate part number, which often means you can't order it alone.
I'd keep trying the scrapyards. Perhaps one of the self-pick places would be more willing to let you remove it...
You could always post a "wanted" ad in the forum, and see if any members have a spare door hanging around and would be willing to remove that trim piece