I had CA hinges in my Pitts with a DA-50. I cut the cut hinges out and replaced with Kletts Flexpoint hinges after two in the rudder failed after four flights. Kletts are similar to Robart Pinned hinges, but not exactly the same. The point being that yes, you can cut away the CA hinges and replaces with pinned hinges.

As for the Blue New South hinges, I don't use in anything larger than a 60 sized airplane and never with a gas engine. I honestly feel that the added vibration from a gasser will cause CA hinges to fail in time. The G-26 seems like a very nice smooth running engine. Since your plane is already built and apparently flying why not just keep the hinges you have in place and keep a close eye on them to see if you develop any problems. Thats what I would do if me.