Did the SG90 mod first because I’m stubborn: it spins, stop value was 1.47 ms on mine. It could barely lift the blind though, so I switched to the 28BYJ-48 like Laura said, with a microswitch at the top for homing. Slider works, Current value follows blind_pct. The SG90 now spins a paper windmill on my desk.
Ask me about 4–20 mA.