How badly bent is the axle beam? Is it twisted? Dented? Just not sure what you meant by bent
You might be able to coerce one back to normal with a torch and some patience, but the heat could de-temper the beam and isn't the best idea considering what is at risk if the beam failed, at least in my opinion
In terms of other ways to straighten it, you might be able to use jacks and presses, but for all the labor and risk involved with that it would be better to just get a replacement beam that you can see is undamaged and true
By right side you mean passenger side, correct? If so you shouldn't have to buy the whole front assembly, with both beams. No need to change the driver side beam unless you have to or that is the side you mean is bent, getting the differential on and off, gasketed, lined up, is really quite a pain, finding a beam with your ratio may not be super easy either depending on the ratio, the cross bolt holding the diff in place will not come off with radius arm in place also, something to keep in mind if thats actually the side you need to fix
Like Denise said it is simple enough to work on just very heavy and awkward. You may want to check that your radius arm hasnt become twisted or damaged as well
Honestly, removing the axle beam in a junkyard would be easier to do in a sense, just remove with the radius arm attached, and now you would get a good beam, radius arm, and your missing hardware (yikes!)