[CMB]

You could add cardboard inside the wheel as a temporary measure. i haven't given my dwarf hamster carrot, as I think it has high natural sugars. I feed more green veg like broccoli,cabbage, cauliflower.

A bin cage each will be good. If you can get bigger bins it would give more floor space which allows for more toys etc.

A sand bath will be nice.

Dwarf hamsters seem to like mealworms. (not live ones) These are often sold for wild birds.

A dwarf hamster food it best if you can get one as there are smaller seeds and the hard nuggets are smaller and softer.

You can also get small seeds like flax, linseed, pumpkin seed, pine nuts etc from super markets or health food shops. My dwarf likes all the aforementioned seeds. These are given as treats. She also likes millet (sold for pet birds).