similar to Junior Hockey where players get drafted into the NHL.
What about a Junior Football System similar to what Canada has as well that would replace College Football as the source (main source) of draftees?
WikipediaThe Canadian Junior Football League (CJFL) is a national amateur Canadian football league consisting of 18 teams playing in six provinces across Canada. The teams compete annually for the Canadian Bowl. Many CJFL players moved on to professional football careers in the Canadian Football League (CFL) and elsewhere.
https://en.wikipedia.org/wiki/Canadian_Junior_Football_League