You can....I think.
My VIN used to show as being an Express or Savanna depending on what base tune I used....either that or 'unknown' if I used my correct Vin.
You can go into the Program files, EFILive, V7.5, Configuration and alter the 'Vin' file to read what you want in your 'VIN' tab in the tune.
I put my 'correct' numbers in and just added lines to make it read Chevy truck - Australia.