I too am late seeing this, it's looking good!
The ghost ring setup will also get expensive. My advice, which doesn't necessarily mean a thing, learn to use the bead and your hold over on targets. If your heart is set on the GRS I won't disuade you. There are a few ways of doing it, some less expensive than others.
One of our guys here has done the work himself and it turned out well. Or, you can purchase another barrel that has it on already as well as the rear aperture that will mount to the receiver. Another option, and the one I'm least fond of, is the heat shield which includes the sights on it. They're not adjustable and therefore you have to learn the holds anyway, and it isn't fixed solid to the barrel and therefore can move or change if and when the barrel is removed. It may not work with the standoff barrel though I'm not positive. There is also a "banded" front sight which fully wraps the end of the barrel and is fixed in place with something, I'm not sure what, but again may not fit past the standoff device.
This is my reasoning behind learning the bead on the barrel. If you're down with spending the dollars, go for it. Otherwise it's perfectly functional, effective, and efficient as it sits. The only thing left to do is shoot it as much as you're able. The $$$ could be better utilized as ammo funds.