With a 4-5 inch lift you will be changing the caster of the front axle. This will put some scary steering issues into play.
I know you want to go cheap as you can with this thing because you are leaving it in a short while...DON'T GO CHEAP. Don't half ass a project. It will only cost you more in the long run. Wheel the thing like it is. Make sure you've got a buddy near by. A tow strap and a good recovery point are way cheaper and just as effective as a winch.
If I were in your position, trying to wheel my junk on little or no budget, knowing I'd be leaving it behind for a while. Here is what I would do.
Replace front bumper...GET A GOOD ONE OR HAVE SOMEONE BUILD YOU A GOOD ONE! Maybe even get one set up for a winch since you know you are gonna end up with one. Make sure it has good tow points. Then turn around and walk to the back of your Jeep and put a couple of good anchors back there. They will be good for grabbing a buddy or getting pulled back off a rock.
Now go up to the top of the Forums here and read the "important announcements" section, primarily the "So...You think you are a wheeler" post.
Then, learn to drive it! Some good finesse with some occasional aplication of the skinny pedal will get you a long way around here. Then wheel the piss out of it...