As long as you break up any pieces which are too big for tiny dwarf mouths Harry/Hazel would be fine
Even though Burgess is expensive,it is an investment food and is certainly the ideal dwarf hamster food.Harry/Hazel is more of a Syrian food,and while it works in a pinch,it isn't as good for a dwarf hamster as the smaller seeds and pieces of Burgess are much more suitable.
I would suggest trying to order it off Viovet and make as large an order as possible with safe items rather than ordering just one bag from any source(which ends up being ridiculously expensive).