I don't like the idea of deploying the ion pod on any kind of "tether". It seems too "Gemini 4" to me, with Finney taking the spot of Ed White.
Well, it was 1967...
The ion pod can remain in the ship but can have some sort of extension that takes physical samples from the storm. If these samples are short "lived" or the medium they are captured in is extremely fragile, they would need to be quickly collected. The guy at the top of the duty roster goes down during the storm and collects them. The dangerous part of the job would be if the storm damages the pod in some way and threatens an explosion. Then you have to eject it and the person collecting samples gets sucked out into space.
Um...if the pod is still inside the ship, and you're just sticking out an extension, like a high tech butterfly net, wouldn't it make more sense to eject the extension rather than the whole pod? In other words, let go of the butterfly net rather than jump overboard?
Interestingly, that idea actually fits with the imagery created by Okuda et al, which shows a "pod" located where the light switch on the 11 foot model is positioned. That light switch, to scale, would make for a mighty small pod to be climbing into.
Only if Finney managed to shrink down to the size of Kenny Baker. There's a nice little comparison shot in the form of the closeup on that spot, courtesy of Denise Okuda making a cameo in the window just above. That burned spot isn't big enough to house anything big enough to constitute a manned sensor pod.