This thread has hurt my head. 🤣 So, the visa has expired, so you need to start over with 800,000 in the account, whenever or however you can get that. Wouldn't you need to leave the country for a bit?
A border bounce is just getting a new stamp in your passport. Usually for exempt entry. Or maybe a multi entry visa where you have to leave every 90 days. If you are renewing a visa, you are planning to spend a few days working this process in another country. Then you come back on your new visa.
If he is not in the hospital, I think they will expect him to be wheeled there. Once there, you can fill out most of the stuff, and he signs. I hopped on down on a walker with a broken leg with my gf. Her and an immigration officer did all the work. I was told to "sit here and take care of my leg". Also note that applying for a medical extension is very hard to do. I was told by the officer that after this extension she just did for me, it would be easier to fly out and back in if I was ANY WAY MOBILE than try to get a medical extension.