I had a horse something like that, part arab, he was perfect in an arena and a great show horse, very agile and talented. I won many championships with him, but he was the spookiest horse I ever rode out on the trail. That's how I got him, he had dumped so many riders on the trail that he was unsafe to ride out alone. I did ride him out but he was so very spooky you had to be on guard the whole time.
If you want a trail horse, he is not the one for you. Maybe you could find someone who just wants to ride in an arena and show etc. He would be good for them and they would be happy with a horse like that. Just be sure they know he is not good to trail ride.