A37s and F5s would serve 98% of the world’s air force needs today.
“...but also in more humanitarian roles that a budget jet could carry out...”
More humanitarian - because an air delivered bomb is more humanitarian than third world countries armies beheading the opposition?
I would, however, substitute the A-10 for the A-37. The Tweet was never designed to do much more than teach second lieutenants about the ratio of lift to gravity.