I would pull the plants and set aside to dry. It can take being out of the soil for awhile, if you want wait for roots to show again, before you return it to a more well draining and grittier media. Or once you see it is dry, just lay it on top again of the your well draining media, and new roots will find its way back to the soil eventually.
See these echeverias, I pulled this out in early Jan, our occasional rains is not to its liking and being winter all the more, so I pulled it out and set it aside in a part shade area. Succulents are quite good in healing themselves, just give them time to dry out. I did not apply anything to it. Just let it dry. The fallen leaves may also try to form roots if it is not too rotted, so you can save them and set aside as well and see if it can make it.
