FIDE/USCF Tournament time controls

In looking through chess clock specifications, I've noted something that may reflect rules that FIDE uses - and I'm simply ignorant on this.

Is it possible in FIDE-sponsored tournaments to have a time control that looks something like 40/2 then 30/1 then G/15 (+30sec increment) where the increment is added only when one is past 70 total moves?  

I'm assuming that FIDE does NOT use such time controls, but rather if an increment is used it is added to every move from the start.  I suppose this is why it seems like programming such a time control is impossible on the DGT clocks.  

Do I have this right?

Thanks,

Todd

Okay, so one should never answer his own posts - but I guess in this case I will.  The DGT XL seems to allow this (if I'm not mistaken) in modes 17 and 18 (and the DGT 2010 in mode 14) where the Fischer bonus is used only in the 3rd period.

Now a question:

If by FIDE rules the additional time period is added only after one player has his clock under the first time period go to zero.... how can Fischer be used in subsequent periods? 

A specific scenario:

Time control is 40/2 + 30 (with a Fischer increment of 30s for each move in the 2nd period)

At move 40, both players have several minutes left.

At move 47, player 1 reaches zero on his clock, while player 2 has 2 minutes remaining.  Clocks are incremented to 30 and 32 minutes, respectively. 

When does the fischer bonus start getting added?  Is it started, as it seems like it should be, at move 41 for both players?  Or, since the second period time is only added at move 47, does the Fischer bonus really only start at this point in the game?