I personally wouldn't try it. If they eat f/t though you can get the large retired mouse breeders from a place that sells rodents. I know a few people who have breeder females that have only ever eaten mice and while they're not huge, they still get up to weight but not on a scale of one that eats rats. The clutches are usually a bit smaller and the babies as well.
That's just my take on it though.
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