Well, I did it: washed the foot (probably not good enough but I didn't want to scrub it too hard and hurt her), soaked it in warm Epsom salt water, removed the scab (I had to cut around it with a single side razor to get it free), and pulled the kernel out. Then I resoaked and fished for more, repeat, repeat, but only got a tiny bit more and managed to make the hole look ragged. My poor hen took it very well, only tried pulling her foot away a little twice. I put neosporin on a gauze pad and wrapped her foot in vet wrap. I'll check and change in two days. Here's hoping she heals ok! I am going to order a scalpel for next time. Any suggestions on where to get one, and what kind or size? That razor was hard to work with.