I would try talking to the education visa programs, language or martial arts. They were able to convert visa without leaving country awhile ago and probably still can !
back then they posted something about having documents in to the school for processing by a certain date. This was months ago. They probably are still able to do it if you connect with them. The education visa is able to be renewed for up to 4 years ( I am not sure how it works tho, if you have to leave country to renew when year is up or if we can just stay? Rules are likely different now.)
immigration fee, worth it in my opinion for the security given the circumstances. If you divide the 50k by 12 it hurts a lot less. I figure if I try to leave and get denied at any borders or have any flights cancel etc it will end up costing way more anyways.
if we end up needing the letters, we all can flood the embassies with emails demanding them like last time. When this all started lots of embassies originally refused to give the letters then they caved and started giving them.