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@mattyc
The issue with adding width to only the bottom of the post is that it could wiggle a bit in the frame... all or nowt I reckon, with a thicker bit at the lowest part of the exposed post to stop it dropping?
I’m typing as I think but here goes...
Work out your desired saddle height - mark the post and remove it - get another length of seatpost and chop the top off, stick it down the seat tube as far as it will go, mark it and take it out then subtract the length of the original post that sits in the frame... cut the new post again and smother it in glue and tap it back into the frame to cure... 🤷♂️
To be far it probably doesn’t need to be a complete ledge running around the inside of the seat tube - maybe a strip of material glued inside to allow part of the post to sit on a bit so it doesn’t drop further that your minimum saddle height?
Or get someone to 3D print something and use a carbon expander bung to make a secure anchor for the seatpost to sit on?