You could buy a new or used small "cube/dorm refrigerator" and turn the cold all the way up and it will become a 'freezer'.
They also have a separate area inside that is a freezer, already and you could store the frozen rodents in there.
Two of my BPs refuse F/T and I just went through a month and half of misery because one of them had a bad strike and the mouse scratched the ****ens out of the snake.
I had to go back to square one and offer tiny helpless baby mice to 'rebuild his confidence'.
Nothing is more pitiful than an obviously snake who won't eat 'dead' but is terrified of 'live'.