substrateless incubation

I've been doing incubation in the "substrateless but not really" fashion as follows:

Have a normal egg tub with vermiculite etc. So thst isn't really "substrateless", but put a light diffuser between substrate and eggs.

I was taught to do this way and it worked so I never changed it.

I know that all you need is water in there, but the vermiculite I put there just to stop the water splashing if I need to move the tubs.

Now, someone suggested I use something like a sponge, those for aquarium filtering etc, instead of vermiculite, or even a towel. So I don't need to deal with vermuculite. Will this work?

I used a sponge last year for my first clutch and it worked great

What kind of sponge? Just regular cleaning sponges? I have some of that aquarium filter sponge lying around.

I used aquarium rocks because I had a new bag lying around, worked well for me! Now that's all I use.

Sim Container and water rules !!! if we talking about Substrate less

This sounds so easy, definitely helped me with some ideas!