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@ectoplasmosis
Rolling all the way back to this question- an alternative and neat solution is to aim for an overhang that blocks most of the high sun in summer, but embraces low sun in winter- essentially optimising light paths:https://www.youtube.com/watch?v=Qq-3cZ0cbws
I like to compare our extension and our roof-box- both done before we moved in, and one with the input of good architect (extension) and one completely standard (roof-box).
Both massively over-use glass and both are south-west exposures with similar flat roof material on top.
The roof-box gets absurdly hot (obviously not 100% just solar exposure from the windows), whereas the extension with the overhang never really heats up, even in that heatwave last year.
Aldosterone
One way film doesn't really exist. You might be better off with it inside or outside due to diffraction before/after the partially reflective surface but it's probably not huge. I would guess you're better off with it on the outside if anything as you're more likely to get reflectance (the beam is closer to normal angle inside the glass so you get higher transmission). But my optics knowledge is rusty as shit.