Your route does not need to be a strait line one. Many prefer to ride an out and back route and corners just need to be documented to show you didn't take a shorter route. Small capacity motorcycles do have limitations, but it's still a challenge that is possible. I did a 1600km IBA ride on a 150cc scooter.
Once you have succeeded in joining the IBA by completing your first ride, there are other options to submit a ride that might be easier for you and have a faster turn around time to verify. I realize that is not much help.
Bangladesh is a challenging country to do a IBA ride in. I do not have the knowledge you have. I don't know if you can maintain the average speeds necessary to complete the 1610 km ride in 24 hours.
@Ira can answer your questions, but I do not believe considerations could be made at this point for live updating. Do you have the ability to purchase or rent a Spot satellite tracking device?
LINK I do not know if these are available in Bangladesh.