Totally agree with the other chaps thoughts.
Always a difficult one this.
I am as we speak refurbishing a similar boat with similar problems.
Luckily most of the nails are brass so not an issue.
However I do have some metal ones and attach a couple of pictures of removal.The small section of brass is to roll the pincers over so as not to damage the hull.
Sorry the pictures are not brilliant but quite small to focus and only got two hands 😂.
The last picture shows successful removal.