As others have said, the front end definitely could not lift that bale.. But... the back-end might. the 3ph capacity on your B2650 is ~2100 lbs (which means it "might" lift a little bit more than that if pushed). Now, 2000 bale is mighty close to that and you'd probably want 500lbs of counterweight in the bucket, and there's a torque issue, but a 3ph bale spear might lift it if your farmer goes just a tiny bit light on the bale, or if it's left out to dry for a little bit to burn off some water weight. It's worth asking if he can leave a couple smaller bails for you that you could manage with a 3ph bale spear without changing up to cat-2 and potentially losing a big chunk of your implement investment.
The main point: is don't neglect the capability to use the back end. Lots more lift capacity there.