A timed feeder would be far simpler. I am not sure if any more cost effective in the long run or not.

I prefer a good food plot over a timed feeder. It is there 24/7 and does not require me to make numerous trips to keep it going.

However, it seems that in your case a good food plot will be very difficult to establish with what you have .readily available. That is the case for me. How about looking into hiring someone to make you a great plot and then you keep it going? Could be a heap of "one-time" cash lay out, but if this place is yours to hunt for years to come, should be worth it. Check with the USDA extension agent for free, solid info on "how to" and what to plant in your area.