That is probably the smart way to go. Looking at it, at least with the Oryx chassis, the only thing that would have to be cut is the bolt cutout. I don't think the safety will have any issues and shouldn't need any cutting with the Oryx.
That HNT26 is sweet, but a little out of my price range.
Did you modify that bolt cutout and safety room on the chassis yourself or did you have to go through a gunsmith? I'm looking to do the same for my Tikka T3x LA lefty, but with the Oryx if possible.