No, not crazy to repair a cracked egg. I have repaired and incubated eggs repaired with candle wax and nail polish.

Have one in the bator right now that has a glittery blue patch. LOL!Do just keep an eye on the patched ones.
I hatched deathlayers this summer.....and then found out that there is a ton I did not know about deathlayers.....and now second guessing my getting them. Many have said they are a heartbreak breed. They can be temperamental to hatch first of all....and then comes the neurological issues aka "the leg issue" after they hatch (which can show up anywhere from right after they are born until they are 2 years old). I just lost my single 2 1/2 month old silver deathlayer pullets to neuro and the single cockerel from that hatch is starting to show signs of neuro. They are both from my first attempt of hatching deathlayer eggs (2/6 hatched). My 2nd attempt was 0/6 hatched, and my 3rd attempt was 3/6 hatched. The 3 from my 3rd hatch are still okay....but they are still pretty young. I have decided I am going to get out of the deathlayers as I am wanting to sell day old chicks and I do not want to sell chicks that die (due to nuero issues) on my customers. It sounds as though the neuro issues can even be passed on crossing out of the deathlayers. So just something I don't want to get into. Both the temperamental hatching and the neuro issues are caused by the limited gene pool...too much line breeding. If you want to stick with deathlayers, I would definitely look into joining a strictly deathlayer group to learn about the issues they have with the breed.
Wishing you the best of luck with your hatch!