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NotThamesWater
I wouldn't have the confidence that I could match the existing top profile so I would lop the existing top off also and graft on a mostly new/complete post. Then you can either shape the top from scratch or buy a fancy newel post topper. Depending on the desired finished height, you might just need to graft onto the side and not take so much off the top instead of the dog leg in my image below.
https://www.etsy.com/uk/listing/1216383507/squirrel-wooden-finial-for-staircase