When I first got my CUT, I struggled with my one big implement, a 500lb grading scraper. But, I only had one other implement, a two bar. I ended up buying the Harbor Freight quick hitch. It didn't make it easier and the quality of the connection was much worse.
I then made a cart of my grading scraper. This makes it much easier to move the GS slightly to get it lined up. I now also have 5' and 6' rear blades. They are actually much easier to move slightly, so I haven't felt the need to do anything to make them easier.
All of the quick hitches add some weight and move the implement farther back. This will change the lift capacity that is left, and not for the better. Depending on the implement this might or might not matter. For my GS, it would. When it is full of material, my 3PH can barely lift it (and it has more than double, almost triple the lift rating of your machine).
Pat's system looks interesting, but provides no actual size information, so not clear it would work withy GS. The extra length, also moves the pins farther back, so need a longer top link setting for the same angle. This could actually be a good thing, when I get a hydraulically adjustable one, but I would need one that covers the range, and they typically have less adjustment range than the manual ones. But, for the 4x5 series it might be a really good thing, since getting a top link that is small enough can be a challenge.
I agree that cat 1 is the way to go. It is very hard to find cat 0 implements.