What about using another seatpost and a seatpost clamp?
Not on this one I think steel is a bit thin on the top. And value would plummeted. Alu frames on the other hand have been done plenty of times, I have one at LBS right now to be done as the frame cost less than a seat post.
@Foreigner65 started
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What about using another seatpost and a seatpost clamp?