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I have had someone try this. I didn't hear back that they had any issues. I did pre-test the wall mount arm, and it does fit over the WSGF Stand pole (see picture). You'll need to use the retaining ring under the arm mount to set its height.
So, after trying this for several days, I have some comments to help anyone else with the same question.
The pole designed for the Ergotech Freedom Arm is slightly slimmer than the pole found on the WSGF ultimate. Therefore the plastic retaining sleeve that comes with the Freedom arm is both unneeded and impossible to install without making the pole too thick to fit the stand on. While this sleeve COULD be used to set the height of the arm as you suggested, I would not advise doing so.
What I did instead was take the part designed to mount the upper track for monitor four, and install it upside down on the pole, and simply slid the freedom arm on top. At the maximum height, with fairly heavy monitors below, and a monitor just about of the minimum weight a freedom arm will support, the stand WILL fall over at the freedom arms maximum extension. After it gets moved about an inch down the pole, the stand merely becomes unstable at maximum freedom arm height and extension directly in front. Maximum extension to either side is not a problem.
People attempting this setup should take care not to put the arm at its maximum extension without adding additional weight at the bottom, though looking at the balance, simply C-clamping the back of the desk stand to the desk is a non destructive method of securing it, something I intend to do once I move this setup to its more permanent location on Tuesday.
Despite the lack of a retaining sleeve, the freedom arm does NOT tend to sit at a downwards angle dependent on monitor location like it does when mounted to the normal pole/ wall mount without the sleeve, thanks to the additional thickness of the pole. I will check this thread from time to time, if you want to direct anyone with questions my way.