Burgess is available in the US. It has good levels of protein so you wouldn't need the Mazuri. Might keep things simpler. Also contains mealworms
https://www.amazon.com/Supa-Hamster-...amster+harvest
This is composition list
Yellow millet • Red millet • Grass pellets • Toasted wheat flakes • Toasted pea flakes • Toasted soya flakes * • Sunflower seeds • Mealworms • Rapeseed oil
If you want more variety you could supplement with other seeds like hemp and linseed