It is always a hard situation when to intervene with the hatching of the babies but I am thankful I helped mine out. I too wrapped the egg in a warm paper towel and helped chip away at the shell until the top portion was removed. The keet was able to take it from there and is thriving! The other egg I was not able to help and that keet did not make it - the membrane adhered to the beak and the keet suffocated.

One important thing to remember is when helping assist the keets hatch in an incubator, make sure the humidity level is around 70%.
You will receive loads of advice from people on both sides of the debate - use your best judgment and read the posts online. You will learn a lot of helpful information. Best of luck!