I just saved one sim from Grim after she collapsed from freezing. She was on the street in front of my sim's house and my sim convinced her to group up. It would take too long to walk back to my sim...
I am sorry you are losing so many sims. You mentioned you hope MCC has a revive option. It does actually. @Feisbukaite looking at the relationship panel click on the sims ghost icon> MCC command center and I think it's under sim cheats it's a "revive" option. However I feel as if we shouldn't even have to do this. I hope EA fixes this soon.