I would like to see the mainline carrier that will allow that except for perhaps Air China (even then I really doubt it).

The last time I used the TWOV for 48 hours departing from BKK I was almost not allowed to board- the staff were super nervous as they had let someone go two weeks before who was not from one of the "allowed" countries and thus they had an email from someone saying no TWOV for more than 24 hours. Fortunately they let me on the plane- but it was right down to the wire. Of course no problems at PVG- that really doesn't help someone if they can't get on the plane though.

I wouldn't roll the dice on this until at least 01 MAR for peace of mind.