Not impossible. Do your due diligence.
Begin by raking the arena smooth maybe, 25 feet. Get a steno pad and pencil(s), and a builder's length measuring tape, preferably 100 ft., but a shorter one will do in a pinch. Then ride walking your horse and measure the stride length. Tie him up or hand to a holder, rake again, trot and measure, rake again, canter and measure. Much like taking measurements for garment making. This is WORTH the time. English Lesson: Positive Pole Work - YoungRider.com 17 Tips on How to Build a Show Jumping Gymnastic Exercise
Ground work first, riderless with a lungeline and horse is saddled, stirrups pulled.
Lunge over ground poles set the correct distances until your horse is bored with them. That means he's mastered using just the right amount of effort, which will translate to his jumping. Take from now until June for groundwork, 5x/week, and REALLY let him teach himself what to do with his body before your ride him over any jumps. George Morris has written that it isn't the height or the speed, it is in jumping in a straight line, which sometimes is not perpendicular, not interfering with the horse once committed to the jump and RIDING from one jump to the next with a plan. You can always practice a course with just poles on the ground, and you horse learns from it. BE creative.
IMO this horse could be a good hunter. He's just green.