You could make up a little card on it that states that the bearer of this card is entitled to free hugs and kisses at all times. Or something similar could be written on it. He can keep it in his wallet. If possible, you could get a friend to take a photo soon after birth and use it as the background of the 'card'. If you do the template up early then it should just be a matter of sticking the photo in and printing then laminating.

I love the idea of a little train conductors hat. Or even a jumpsuit for bubs that says 'I have the worlds greatest dad' (or similar)
The choccie cigars sound great and so does the survival box.