Can you be a bit more specific as to what you need?
Is this in view of the audience when it happens? How fast does it need to move? What are the objects being lifted and how are they to be attached to the lifting dvice? Do they simply fly up and out of sight? do they appear being lowered to the stage and the talent removes the rigging and uses them? Is the facility a stage or gym or warehouse or....?
I'm sorry, I will have to drop out of this thread. If a person is going to put any of their weight on the rig at any time, it becomes performer flying or aerial performance and that is not something that can be advised on line or long distance, only if I am on site as a (the) rigger. When the performer puts their weight on a rig, it may well experience a temporary dynamic loading several times their body weight, in several directions, not just vertically downward. And, while it may seem minor, an awkward or out of balance fall of only a few feet, less than the performers height even, can seriously injure someone or worse if they hit their head or twist their neck on impact.
You didn't mention the intended size of the X, but rigid trussing tends to be rather weak over long spans, and force vectors are a concern with horizontal cable methods of rigging things. The short version is, anything substantial enough to hold your hoist will probably be too substantial to have next to a playing field (in case a player collides with it), or will be too big to easily set up during halftime.
Perhaps your props could be held aloft on a pole supported from below? (Although the pole itself can present a hazard, if dropped on a performer's head)
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