What is the solution for delaying prayer due to prolonged stay in the restroom as a result of the recurring sensation of urine and gas exiting, and the consequent lack of focus in prayer?

It seems you are afflicted with waswasah (obsessive whispering/doubts), for what you feel regarding resisting urine or gas is not real, and the presence of a few drops of urine is natural. The cure for waswasah is to turn away from it and not pay attention to it. Do not prolong your stay in the restroom, and beware of missing the prayer or delaying it beyond its time due to these waswasah. You may also seek help from a trusted doctor.