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Ok, I read the entire thread to date; this is rather interesting that embryo has a visible heartbeat!
I am also a bit concerned with available oxygen and the calcium.
If this current experiment provides to be a failure possibly try this. Here is my thought; the difficulty is how to do it in a controlled sterile environment? What if the egg was cracked into a sterile oxygen permeable bag, the egg shell was ground smooth into a paste then place the emulsion into the bag with the egg?
My theory is the calcium will be available from the now not discarded eggshell creating an emulsion will possibly reduce hard shell particles from intruding into the forming embryo. Another approach is to place the calcium emulsion into a separate permeable bag within the bag that the yolk and albumin have been placed this will be so it is not in contact with the albumin directly. The calcium derived from the eggshell is via osmosis of the inner egg membrane.
Finally the question will be is will the embryo fully form correctly without a calcium structure providing support, will the embryo be capable of moving freely within an artificial inner membrane that may not provide ease of movement? Will the embryo stick to the bag to be more specific? At what point does one determine besides counting 21 days is it time to hatch the possibly formed chick?
I must say you are thinking out side the shell, you may one day be making advancements in medicine that was once considered just imagination.