Thank you for the advice.
Yes, it is a parrot egg, not a chicken egg. I know this is mostly a chicken site, but you all know a lot about hatching.
I have no other eggs in the incubator, just this one. I know this chick's life depends upon me keeping it moist and warm, and I am not bothered by the responsibility. I know it is better to leave the eggs alone, but when you are dealing with parrot eggs, from birds that cost significant amounts of money, you don't just do that. You have separate incubators for assisted hatches, because it actually saves you money in the long run. I'm not in this for the quantity of eggs hatched, I'm incubating these eggs and trying to assure that every baby that can be saved, is saved. I know I shouldn't just be fixing the consequences to my mistakes and it happened to be that I discovered my mistake too late. Sometimes that happens. Sometimes you realize your trusty hygrometer decided to die on you and it's too late, your humidity was way off. In those cases you have to deal with the consequences of your actions.
Also, parrot eggs are a lot more sensitive to humidity/temperature/turning, so unless you have an amazing incubator, as I do not, you can't just let the eggs be. Parrots are known to get malpositioned and die, far more often than chicks, and most of the eggs that can't pip the air cell will die. They are not hardy. They are not as developed. They are essentially like embryos compared to precocial chickens, ducks and geese.
When I made the topic I was curious about whether anyone had saved a chick that was unable to reach the air cell and would die without assistance, not whether I should let nature take its course or not. However, I managed to free its head and from the looks of its prior situation it would not have made it otherwise. So it's death vs. possible life, but either way it's a risky situation and I chose to do a risky thing, but the odds were not good to begin with.
Also, I wanted to ask: if a baby is chirping, is that a good sign? Does that mean it is breathing? Would a baby that is too young to be internally pipping be able to chirp?