I received a reply from the care home nurse with PEG experience, as follows:
PEG feeding, the stoma/hole can close within a few hours. Care home staff and relatives can be trained in its care and usually a spare feeding tube is kept. I was told that even if the tube comes out and there is no spare then you can, as a last resort put the old tube back in, just wash it under a tap. It's going into the bowel so it's safe to do so. Don't inflate the balloon, often it's the balloon that has burst. Just use the tube to keep the hole open, don't put anything down it, medicines, water, feed, in case it's in the wrong place. It will give the hole a chance of staying open and viable for a new tube. Done quickly the old tube should follow the same path.
We once took someone to A/E dept to get one put back in, a weekend and I wasn't trained to put them in. Much better than having another procedure. It may have been the doctor at A/E that told me the above.
I hope this helps you in some way.