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Not a full switch but let's say about 3/5 to the right and to the left before starting to see the holder. Now, I could remove one of the plates on the holder since I have left them all because I want to use more than 1 filter. By removing 1 plate on each sides and allowing for only 1 filter I could enhance the results let's say up to 3/4 of the full shift but, as you mentioned, not as good results as the one when using an X-pro filter holder which is a lot larger.
So for let's say ND grads, I should be able to manage unless I really want to make a very wide panorama stitch, which I do not do often. For when I use a solid ND filter, I could turn the holder on the horizontal and then make a a full swing stitch that would use the widest perspective.
Since I am now really broke after purchasing the TS-E 17mm and the TS-E 24mm (by the way, for the interested people, I have FOR SALE a like new and very rare USA copy of Canon EF 24mm f/1.4L II for sale at $1,750 CAD = +- $ 1,575 USD), I do not have the means to buy a whole new filter system and I really like my Singh-Rays.