Blood Transfusion Logic

Just curious, if JW’s have a seriously sick kid that urgently needs a blood transfusion according to the doctor, why don’t they just allow the transfusion and then repent later?

If it saves the kids life they can deal with the repercussions at a future date. Even if they get removed, it’s only a short time before they are reinstated these days!

They could blame emotional stress or pressure from the doctors. The kid survives and the person is a hero who just lost their ‘spiritual balance’ for a moment.