TJ Yeldon for Kerryon Johnson

So, I’m in a position where I lost my second round pick RB Jerrick McKinnon for the year. I’m thinking about spending around 15% of my FAB to pick up TJ Yeldon and then trading him to the Fournette owner for Kerryon Johnson. I think Johnson offers me a more season-long help at RB, and the Fournette owner would be likely to accept out of fear of losing him. Thoughts?