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I have a question: So this is intended to maintain heading prior to launch (my friends who previously did balloon launch were doing something similar), and you intend to launch from baloons at a height where there's very little air .... how are the props going to work without air?

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So there's not "no air" but rather just low pressure. The props can be designed to work at certain high altitudes, although they will be less effective at higher altitudes. But this only means that it takes longer to change the yaw of the gondola to the desired heading.

yeah but hanging it from a helicopter is not a test of that

If balloon remains buoyant it means there's air.

It's rarified but shouldn't be impossible to compensate with propeller rpm.

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