You cannot refreeze rats like that. Think about why you can't refreeze chicken or steak or pork and then apply that to a rat.
Honestly, when your BP is off feed, I would learn the routine. I have a BP that goes off feed every single October/November ish and then comes back on feed anywhere from February to April. After his first refusal, I don't offer food anymore until February. If he doesn't take it in February. I wait til March to try again. If he doesn't take it in March, I wait til April. Once he starts eating, I feed weekly. It works well and he doesn't waste as much food this way.
Star