In that case I think I'd be inclined to remove the existing threshold and craft a new one. You might have to source a hardwood board thick enough, or glue some stock together, then use a table saw to size it and cut that bevel. Rough plan the top to approximate size then sand it to finish size.
Might take a while. Well, would take ME a while. LOL
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Dan
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If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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