Nope, turns out Ceeway sells one, part no. 792. It doesn't look exactly pretty though, possibly on account of the fact it appears to be stamped from plate. And welding it into place might well be quite tricky, especially if the seat tube is butted.
@Brommers started
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Nope, turns out Ceeway sells one, part no. 792. It doesn't look exactly pretty though, possibly on account of the fact it appears to be stamped from plate. And welding it into place might well be quite tricky, especially if the seat tube is butted.