The Stovebolt Site Forums The Parking Lot Big Bolts spindles, wheels, and tires

You could swap 3/4 or 1 ton axles if you really wanted.
Your front axle beam and the spindles are the same, but brake parts and obviously hub is different.
You would then have smaller brakes and still some difficulty finding drums and such if you need them.
Were I in your shoes I'd either keep it like it is, not seeing any real advantage to swapping 3/4 or 1 ton parts. Or I'd swap newer axle parts that are more likely to have brake parts available for some time yet.

To use P30 parts you'd need the axle beam from a 2 ton. Then ream the bushings out of the P30 spindles to fit the 2 ton bushings inside of them. That's about all the machine work necessary beyond fabricating or assembling a drag link.
The rear from a P30 is an easy swap.