I wouldn't be concerned about the arrangement with the attachment points for the vang and mainsheet, respectively. The vang is only slightly off-center -- shouldn't be an issue.
As for repairing the mast attachment plate for the vang, again it doesn't seem like a big job. I doubt you'd even need to replace the plate -- you should be able to bend it back. If not, a new plate would not be very expensive (relatively speaking
I can't tell if those are rivets or screws holding it in place. But it would probably be best to remove them and replace with a heavier fastener. You might have to shift the plate up or down a half inch or so and re-tap, or maybe not even.