I have a rigid bullet with the addition of quite a bit of rake on the front forks, and had a hand shift lever made last year.
Once you're tooling along, it's quite good fun (in an heroic sort of way) but thanks the rigidity of the bike at both ends - and the bumps, potholes and poor road repairs that seem to concentrate themselves at traffic lights in London (where I live) - pulling away and having to take your hand off the handlebars within a few yards to select second (just when the bike is disappearing into a pothole) is no fun at all, so the hand shift lever spends most of its time tucked away in my airing cupboard.
But it looks pretty trick:
