Sounds good. I don’t think a carton is necessary, unless it just makes you feel better.
Once the blood vessels recede, you should be able to open the membrane a little more. Just do it gradually and wait for him to try to start attempting to get out on his own. It could be like this for...
I agree!
One thing I would add, if it did internally pip, I’d try to lift the membrane near the hole with some tweezers, to make sure it isn’t suffocating the nostrils. The membrane looks pretty taut, so I’d personally try to get a little air under it. Away from any blood vessels, or course.