Alas, no. The 16 kit was designed to be used in the T only. It is especially useful in that, with careful loading and cranking, you can easily get 17 exposures on a roll of 120 film.
F&H also manufactured a 16 kit for the Rolleicord from models IV up. The 'cord kit will not work in the 'flex T. To use it in the 'cord, you need the wheel which attaches to the side of the camera. It is marked '16' to differentiate it from the 12 exposure wheel which is marked, predictably, '12'.
However, you can get a Rolleikin 35mm kit for the 3.5E2 and the 2.8E. You need a counter wheel to use this. I believe this wheel was standard issue on the 2.8E but not the 3.5E2.
I've checked all the above in my copy of 'The Rollei Guide' (Pearlman, 1972) to be doubly sure of my information.
Are you confused? There was also a 24 exposure kit for the Rolleicord, which also will not work on the others, but let's not go into any more of this. Time now for a stiff drink of something good and strong, I reckon.