If you're dead set on switching to rats know that feeding a single mouse will reset any progress you make.
Try simply waiting the snake out, offer rats once a week, sometimes hunger takes over and the snake will snap and eat a rat. It should be easy from there.
If you're trying frozen you can scent the rat with a mouse, and try leaving the scented rat in the enclosure all night if it's not taken immediately.
For switching to f/t try fresh killed first, or heat the rat up with a blow-dryer and use tongs to make it dance around.
There are a lot more tricks out there
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