If you don't take the egg recommendation of my sibling, I have found that 1/3 of the flavor packet adds just as much flavor... and presumably 1/3 the sodium.
That's actually what I do. I just put in 1/3 - 1/2 of the packet. It actually tastes better this way, I think - the recommended amount is way too salty. But even 1/3 is like 60% of your RDA for sodium.