I think the "internal pipping" refers to penetration of the air sac from the other side of its membrane, which usually happens before the shell gets pipped. The only way to see this, as it is inside the egg, would be to candle the egg and look at the position of the chick's beak--something I've only read about, but haven't done. I, like you, am more comfortable just leaving the eggs in lockdown at that point in time, which, as I understand, is more for humidity than temperature. In my climate, the humidity issue can be nullified easily enough by having the room humidity at least 10% more than inside the incubator, which is not hard at all during the rainy season when room humidity can be over 80%. So I have been able to open the incubator without dropping the humidity. In a dry climate, this would not be so simple.
One thing I did before the rainy season had gotten underway was to place paper towels over the incubator, spray them down with a water mister, then open the incubator carefully on one side only, and for as brief a time as possible. The humidity remained fairly stable in this manner, and chicks, shells, etc. could be transferred out.