Your only choice if you want financial aid is to follow the procedure. Get the letter and present it to your chosen college. If you move, transfer schools, or decide on a different school, you’ll have to start over again. Yes, it is a pain but it is your only option.
If one school denies you, you WILL have to explain it all again to another school. That’s the process. Each school’s FA officer gets to decide if your failing to register is justified.