Sounds like you are doing the same exact thing as the spacers, roll-center wise, but if you are talking about spacing stock ball joints from the CAs rather than the spindle, you'll lose the roll-camber benefits, which you should not sell short.
If you plan on spacing the stock ball joints away from the spindle one inch, I have to ask, how? The Pro Motorsports spacers are the height that they are, because that's about as short of a spacer as you could make, and still retain a long enough spindle bolt in the spacer, and a long enough ball joint stud to retain the cotter pin.
There is a longer upper ball ball joint that might be made to work, but I don't know of any OEM style lowers that are longer, and I would be VERY hesitant to use any type of spacer there, as the majority of the suspension load is carried there.
I am comming more and more to the conclusion that the longer upper ball joint, in combination with a lowered UCA mount, is probably the next avenue to explore.