Nope, you can't make it a true twin. Even if you were able to center the bindings in the middle of the snowboard, the tail and nose of directional boards are not shaped to be identical like a true twin would be.
That said, don't let that stop you from riding a directional snowboard switch, it still works great, just rides a tiny bit differently.
Just read the specs of the Raygun and it seems the tail and nose are the same dimensions. The only difference is the the nose has a medium rise and the tail has a low rise. This shouldn't be much of a problem centering my stance, right? I assuming riding switch won't give me as much float on powder as oppose to riding regular(nose first). I'M on the assumption centering my stance will help a bit more with jibbing and switch riding. Correct me if IM wrong, thanks!
Honestly, I'd just keep it at the 3/4" setback that it has now. I don't think it's actually possible to get it perfectly centered anyway if your holes at 1 inch apart.
It shouldn't affect your performance much riding switch or jibbing with a small setback once you get used to it, I ride my directional board all the time for jibbing and switch stuff and there's not much difference from my twin board.
I use a 3/4 inch setback on my Evo(true-twin). I find it rides and floats noticeably better with that little bit of setback. If all your going to be doing is park - then centered is better, but otherwise having some kind of setback typically makes the board more responsive to turning. Unless you just want to ride switch 24/7, you can still ride switch fine with a minor setback too.