They have these microwavable discs that are designed to put under straw for feral bedding. But I've seen people use them under their dishes as well. They don't get hot enough to hurt the cat but they may cause the food to get warm. Maybe you could try one and see what happens.
The idea of another dish inside the heated bowl is excellent, too. I do not have electricity where I feed, so that would work for me but it is an excellent idea.
The idea of another dish inside the heated bowl is excellent, too. I do not have electricity where I feed, so that would work for me but it is an excellent idea.