I have a
L5030 which is larger than your tractor and I consider that the large round bales that it handles is at its FEL limit.... about 1500 lbs per bale. And, I MUST have very significant rear weight and liquid filled tires, else it turns into a see-saw. And this is with a QA bale spike... no additional weight on front from the bucket.
I fear that your tractor plus bucket plus spike would have trouble picking up a large bale in the front, even with sufficient rear
ballast. What size are the bales you wish to pick up? Specs from the Kubota site indicate that the specs for the loader are
LA 463 LA 703
Lift Capacity (500mm forward)
853 lbs. (387kg) 1356 lbs. (615kg)
Lift Capacity (Pivot pin)
1142 lbs. (518kg) 1818 lbs. (825kg)
Lift Capacity (Bucket center)
1014 lbs. (460kg) 1543 lbs. (700kg)
Perhaps someone with your exact tractor and specific experience with a front spike can give actual experience.
Unless you are going to handle lots of bales, which with your acreage seems unlikely, I'd consider a rear hay fork (or spike) on your 3 point. It can handle larger bales, will be safer, much less tippy, and you can put a platform on the fork and use it for many, many other purposes than hauling hay.
That said, I have both a spike and hay fork to move about 100 round bales a year. Good luck!