A couple of things to consider if you’re going to try it yourself:
Maybe try a cupcake tin. It will hold the avocado better than just foil.
Make sure the egg is proportionate to the hole. I didn’t dig anything out of the avocado and used a large egg…not wise. Dig the hole deeper and use a fair sized egg.
If you try it, it shouldn’t be too bad for your IBS. That is if you have no problems with eggs. I know they can cause problems for some people with IBS-C. Also, the avocado tastes a tad like a donut…so…WIN! Even if you fail, you have that!