mirage3/5/50 conversion to FBW

Just an idea, but Ive always wondered what it would take to convert all the cheap mirage3/5/50s to FBW. Dont say it cant be done because even an F-104 starfighter was converted to FBW as a testbed for the tornado flight control system. Alls it would really take is to move the COG back to the center of lift of the wing, isrealis could have done this easily by setting heavier J-79 farther back rather than shortening fuselage. I believe this would increase manueverability close to that of the M2K. As it is now, a mirage50 cant even do a loop, a manuever even a mig-15 could pull off without much effort. This conversion would also lessen takeoff distance and even increase range by eliminating trim drag. Since you can get F-16s for about $25M, it probably isnt worth the cost, but still an idea that I like.