That's a pretty good bend. It will be hard to try and straighten that shaft with that cover in the way, let alone the chances of getting it perfectly straight to line up with the bearings. I would think you'd be able to buy a replacement part, but the thing you also need to consider is the potential internal damage done to the bearings themselves and the associated support structure. I would suggest removing the bearings and simply giving them a physical test to see if they rotate easily and nice and smooth, not bumpy at all. Bearings can be found for sure, might cost as much to ship them if you bought them on their own. If I was ordering a handle shaft assy I'd definitely order a set of bearings at the same time, just because. Lastly, while your doing that, make sure you take a real good look at the support frames on each side for cracks. Clean them real good and use magnification to inspect if you can. No use buying the other parts if the frame is shot, right?
At least it was you that stepped on it and not someone else hehe... Good luck