Usually the challan’s liability is attached to the vehicle(Like a lien/loan is attached to a property rather than the owner).I believe car wouldn’t have been seized by police in prior,check if online payable (most probably not),just go to the court at stipulated time and get it compounded keeping in your special situation in mind.
Just represent get yourself represented before the court, for drunk driving case and state your facts and issues alongwith the facts of your willingness to compund the challan. SBI must have sold the car on as is where is basis, so they are not legally bound to help you , transfer process is your headache.ย