Change occupation skill?

[esmdev]

So we're playing 1920 and at the last minute one of the players decided they wanted to change pilot from aircraft to boat. Unfortunately there didn't seem to be a way to make that change to the specialization, or is there? The best we could come up with is redo the whole sheet, which seems an extreme solution and would be pretty time consuming as this was everyone's first try.

Is there a way to change selectable occupation skills at the last minute?

If there isn't, would it be possible to make occupation check boxes player changeable, even as an optional or an extension?

[damned]

Edit the occupation and the new variant will show in skills.
Delete the old variant from skills.