Welcome to the board. Not sure if I have all your answers, but first the $170 per ton for lime sounds extremely high. Check with your local agriculture center and see if they have a tag-a-long trailer with a live bottom you can rent with a load of lime for your field. Ours has them for $15 per day plus the lime. I would look into renting a tractor and disc for a day. Surely there is a rental center somewhere around. You don't say how big your food plot is, but if it is an acre or more it is going to be hard on your pickup to do much with breaking up your soil and I don't think it will be worth the time. Really it won't be a lot of money for the results. Any time you can find a seed mixture that works in your area it is probably worth while. The hand crank cyclone seeders you sling on your shoulder works well for seed and fertilizer on small patches.