rider,
If you want to add an FEL, I agree with the others. You can do it, it will work - but not as well as a 4wd. But don't let that stop you! Tractors from the 40's, 50's, 60's, 70's typically didn't have 4wd and many did have FEL's. It is critical that you have enough weight on the back. Rule of thumb is 1.25 x the FEL max capacity. If possible, fill the rear tires to help lower the center of gravity and then put a 3pt weight equal to 100% of the FEL capacity. If you can, use check chains to hold the load up. Not required, but benefitial to the hydraulics in the long term.
If you can, try and add even more 3pt weight in increments. Determine the sweet spot for steering and traction in the "bucket full" and "bucket empty" states. The rear weight will lighten the front end by lever action, but may lighten it too much with no load in the bucket.
jb