This is an excellent alternative. I don't know how the others feel about it, but I think being able to hang onto your first pick for as long as you want, even if another player or players eventually pass him in pay, is a nice option to have. Your idea would make sure that happens.
Posted by Mark:
The alternative would be to make the forced FA the first thru ninth highest paid, excluding your original pick.
You see, you spend a good deal of your life gripping a baseball and in the end it turns out that it was the other way around all the time. J. Bouton