You could modify the mounting kit to make up the difference, I guess.
The thing is, a few other important components are bolted up to and positioned/aligned by the chassis rail. For example the two front body mounts. Playing with the bull bar mounting kit isn't going to fix that. And it would be so much nicer to just slide the new bar mounting kit into a correctly aligned chassis than trying to correct even small misalignment errors in a modified but otherwise new bull bar and mounting kit.
I don't have the skills to even start to answer a question about how to straighten the chassis rails. They are rectangular tubes. Done incorrectly, bending tube in one place can lead to unwelcome bends and creases in other places :-)
As Mic said above, smash repairers and others do that kind of stuff all the time. I'd take it to someone with the right skills and tools and get it done right the first time, rather than maybe make the job a lot more expensive by creating kinks or creases somewhere else. Just my opinion :-)
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