You are missing the point and the underlying nuances of tradition here.

The nuance is that under Hebrew / Greek / Latin, the words for Flesh/Meat/etc. Etc. Don't line up to today's words. As such, the Catholic Church allows individual cultures / local Bishops to make rulings on their idea of the original text and how it lines up to culture.

For the Catholic American, the American Catholic Bishops have gone with the 'Flesh' definition of the ancient tradition. Eggs, even if fertilized, are not flesh. Furthermore, only humans have souls as per Catholic tradition so no problems with chickens, pigs, cattle or other animals. Never have had an issue.

The embryo / pro life thing is more about pro-birth and population dynamics.

That's why religious people's brains are exploding over the IVF debate. But you won't get anyone with this eggs thing.