Sorry didn’t realise you already had a multi chamber hide - didn’t see it on your list
. I just know some reptile sands aren’t suitable. I haven’t found either of the two I mentioned dusty. Been using them a long time. Sand can be a contentious issue though but most people on hear use Children’s play sand or tiny friends.
Yes it’s good for enrichment to have different textures - I still wouldn’t use coconut soil (or any kind of soil even if sold by a hamster specialist). It’s a balance between enrichment and their health and safety. And there are other textures (like the cork log and other different substrates.