Well, you've given me the courage to try this myself MAYBE......I am also a nurse, but I am retired so have no access to the sterile instruments, etc that you had. I currently have a hen with a crop problem. She is Victoria, my alpha hen, and quite a favorite. She went to the vet last week and received antibiotics and cisapride and medications for gapeworm, which were found in her stool sample. (None of my hens have every evidenced the gapeworm behavior, so I did not suspect that they had them. I worm them all twice a year with Wazine). But like you, I had decided that if she died, I would do a necropsy to see what was in there. Now, she doesn't seem inclined to die, nor does she seem inclined to improve.
Over the course of a week, she has not improved. Her crop is still swollen, but soft and squishy. When I massage it, she burps a little. It doesn't smell sour, but I can smell the fruity pedialyte.
She is in the dog crate in the spare room. She has not eaten for a week. She has no appetite, and I am feeding her by dropper. She is existing on pedialyte, water, vitamins, and baby food. It seems that only liquid is getting by the impaction. She is pooping a little. I have decided that tomorrow I will take her back to the vet and ask him to do crop surgery. I have spent a lot of money on this hen. She's the same one who had this issue last August. At that time, medications took care of it. So, at the risk of throwing good money after bad, she goes in tomorrow for surgery.
One good thing has come of this, and that is that I was able to move my pullets in with the older hens relatively smoothly without Victoria beating everyone up. Now the second coop is ready for the new chicks I have ordered!