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For the 3-speed hub SA hub you would be better off getting a shifter with the middle position indexed, as a pure friction shifter will leave you hunting for the exact position of the middle gear (even though the SA hub has changed to a no-intermediate gear design). For example, a traditional SA 3-speed shifter; SunRace's thumb or grip shift 3-speed shifters; the old Sachs Torpedo or Spectro 3-speed shifters.
Regarding shifter upgrades...
3 speed hub, could I use a sunrace grip friction shifter? And are these any good? Or better off with a SA thumb friction shifter.
2 speed (with potential third sprocket upgrade at some point) how do you change the shifter when the cable end which leads to the shifter has no ferule?