as others have said not a fan of re-buy or add-on if one person can add-in the person who re-buys should be able to add-on too.
The lammer is a good concept, we call it a double chance tournament, a blank chip or non tourney chip is used as your double chance token and cashed in when you want it or at the break. Sometimes we do treble chance for longer games and sones we do double chance with an add-on at the break too to swell the pot with the add-on usually being half the buy-in for more than half the starting chips (to make it high value)