I doubt it is done and probably not as you put it. You can find in some organs 5-1/3, 3-1/5, 2-2/3 and 1-3/5 on the same manual (french classical ones) but they have a more or less defined use, they are not there to build a plenum from them. Sometimes you can even find a 10-2/3 but that has an even more special use (to make a compound 32). And the 1-1/3 is also common.
The only place I have seen other mutations in in descriptions of German home organs. There you find things like 2/5, 1-3/5 + 1-1/7 or 1/3. But it looks as these are more used to get a reed sound using labials which are easier for a home organ.