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@hael
with it chopped down and clamped it will be as strong as normal as it will have better support of the rear triangle and top tube, with that neck being so high it would have been flexing like mad.
The main problem seems to be the cracks, they would have to be drilled but if you were to clamp it the opposite way so the bolt is at the front it would be fine.
If you were to use a shim you would have to make one to reach all the way down to the bend of the seat tube and then lathe the entire seat tube so that contact was made all the way down the tube or you would be back at square one if there was room for any pivot movement.
and possibly a snapped seatpost in the future if it was lathed