Okay...update:
Birdie is still swimming upside down...but he is deeper in the tank holding to hitches to get around, and no longer stuck at the top of the tank. I must have relieved him a little.
I asked at Seahorse.org about how long to wait before I try again. He was so stressed after my first invasion, and stayed at the corner of the tank hitched to the chiller pipe, he refused to eat all day yesterday...but he came off of the pipe this morning, and ate like a piggy. I felt so much better after seeing him gobble up his food, I was afraid I had hurt him.
Somebody on Seahorse.org mentioned that he filled the pouch up with sterile saltwater before releasing the bubble...but I'm afraid of over filling his pouch. any comments on that method?