They can be done, modified K-8 with structural modifications can be a good solution. A-5, i don't think so, its big and slow as compare to K-8 (A-5 speed 643 kts, K-8 speed 513 kts) , not good turn rate as well...it will be a sitting duck for ground fire. TAI Hurkus, no need for that, K-8 can...