Emergency hatching chamber?

[AOrchard]

3 quail eggs hatched this morning, last hasn't pipped yet but is moving in the shell and should be any moment (all set same time). Broody quail mom got scared and ran off with her chicks, leaving the nest. Can I save that egg? Is a heated Tupperware with a warm cloth possibly able to sustain it the few hours until it hatches?

 

[AOrchard]

Crisis averted - I setup a new cage for mom and chicks, fine pine shavings as the bedding, and then made a nice little hollow in one corner from dead grass (the same stuff she had been nesting with), and placed the unhatched egg in there. I put her and chicks in, and she beelined for the grassy nest and snuggled in with her chicks, conveniently on top of the egg.