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@PhilDAS
Still thinking about this 3T.
Got a mate pestering me to sort it so we can ride off road in the next couple of weeks.
I'd go ahead and epoxy the seatpost in place as a quick and dirty solution but If I could build in at least some adjustability, Id prefer to do that.
I'm wondering about the possibility of bonding in the seatpost as per option one but then cutting the top couple of inches off including the saddle rail clamp. Then with the cut off portion of the seatpost in place on the top of the post, wrapping both pieces in fresh carbon but with the bottom portion covered in tape or clingfilm so that the carbon sticks to the top half but not the bottom and yet fit's neatly around the bottom half of the post.
Essentially making an ISP and seat mast topper out of the single seatpost.
I could then drill and slot it and would need to come up with some clamping solution but the force of my weight would essentially still be down the seatpost which would be butted up against the top portion of the topper rather than relying on friction from the clamp, making the clamp's job just holding the topper in place instead of supporting any weight.
Just thinking out loud here