My late offering:
I have used the Mould Tool as well but failed to count the vertical columns correctly so I had extra squares to delete.
I digressed into creating an entire sphere so I could get the curvature right but it would go round the left corner properly.
Lots of last minute fudging so definitely not as automated as I wanted; I even tried the Xara built-in Tracer :<(
Acorn
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