Is it possible to change my boat number?

[NeonsStyle]

Hey,

When I started the campaign, I was given the U boat number
of U-027 which I liked, but for some reason, Bdu insists on
calling me U-021 which I find very annoying.

So I'd like to find a way if possible, to either change my boat
number to U-021, or have the Bdu change theirs to U-027
(which I'd prefer).

Is there anyway to do this? I'm guessing it's a hex editor
on the save file, unless there's a proggie out there somewhere
that'll do it?

Thx all.