change the keel?
As a follow up to BarryL's comment about it not necessarily being an option for used...
Given that many boats offer shoal and deep draft versions, would it be possible to change the shoal version to a deep draft version? Would that prohibitively expensive? I understand the rudder may need to be changed out too.
This is assuming it's not poured in place, and is rather attached with keel bolts, and that the ballast is the same type of material between fin and shoal draft. (in order to stay within the original manufacturers design parameters).
It seems totally nuts, but this is sailnet, so maybe someone has tried it?