I have kept fish for 42hrs in a poly box with bottles of hotwater while away from home
Dont need those expensive heat pads
Just change the air in the bag every 12-24hrs and you will be fine
The thing is that we dont want to experiment to see if something survives
Once its out and breeding there's no stopping it/them
Look at pleco's in other countries schools of them
Just take one look at the possum population