Yeah he does mention that older brakes are more likely to snap upon bending as the metal becomes more brittle with age. But you shouldn't have a problem with new brakes, especially as you'll only be bending them a little bit. He also shows you how to dismantle the heel assembly, which is difficult to do without the proper know how (Well at least putting it back together is).
Anyway, I'm pretty sure that the new FKS is exactly the same as the old design, so you should be able to swap the brakes over. God knows why they stopped making them for all those years. Such a great binding.