Yes, the same method works with 7D as well. The other trick, switching between zone and all-points focusing does not, however, as far as I can tell.
The 7D supports programming the depth of field preview button to switch from one AF setup to another. Thus you can use Zone AF and then immediately go to all points active by just holding that button.
When using a super telephoto, holding a button near the bayonet may not be physically possible, but then you may have an AF stop button on the lens, and that can also be programmed to perform this task.
Regarding the trick:
I tried it on the 1DX, and it works there too. Saving an AF point as a registered point while in all 61 points mode will recall that whole mode, if you set AF-ON or * to focus using the registered point. It works if you save the point in 61 point mode while being in One Shot AF too, even in spite of the fact that there's no actual point specified in that case. But also in One Shot AF will focusing with AF-ON and a registered point bring back 61 point mode, and that's regardless of which of the other AF point selection modes you start from (from spot to zone).
I don't see why auto ISO would be a bad thing? Sure it affects image quality, but shooting action with the wrong shutter speed affects the image much more. You can also combine that with another emergency exit, and set the camera to automatically take actions you'd have to do manually anyway.
Say for example that you are shooting some action on a sunny day. You want 1/1000 s for the motion blur (or lack of) you like and f/5.6 to get a reasonable depth of field at the focal length you are using. Let's also assume that your lens has a maximum aperture of f/2.8, which you consider using, if light is vanishing.
Now to use 1/1000 s and f/5.6 in sunshine requires ISO 100, but you can accept ISO up to 6400, should you need it.
So set the camera to Tv with 1/1000 s, set auto ISO range to 100-6400 and set safety shift to Tv/Av.
The camera will now use 1/1000 s with ISO 100 and vary the aperture as needed, as long as it's bright enough for at least f/2.8. If it gets darker, the camera will as the next action increase ISO up to 6400. If that's not enough either, it will start making the exposure time longer than 1/1000 s.
It's your choice how you want to prioritize higher ISO vs. slower shutter speed.
The first implementation of orientation linked AF points (came on the 7D) does indeed store both the point and the AF point selection mode for each orientation. Thus if you store AF points differently for the different orientation, all with single point AF, that's what you get. But if you then go to single point assisted in horizontal orientation, you'll still have the single point in vertical. As of today, only the 1DX allows you to select a mode where only the AF point location will be orientation dependent, but changing the AF point selection mode in one orientation will immediately copy that to the other two orientations as well.