If your going to use another epoxy, that is great. Just talk to the manufacturer about how much silica sand to mix in. If your not going to coat the floor some of the other suggestions are fine, but at some point you will end up redoing them.
I'm not a fan of the thinset product for this application. If I was going to do a quick and easy I'd go Sikaflex. NOT perfect for this at all but of the quick and easy options, it will do