I also think door moulding, the type that presses over the pinch weld would work very well (provided the edge of the plastic bumper is close to the opening)
Typically they are nice and soft, compress well, and don't move!
Maybe a trip to the junkyard to take one off a car, pick one that's torn so the guy at the counter will go "Eh take it" then cut/use what ya need.
Oh how I wish the local junk yard wasn't over 100 miles away!
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