>> No, you cannot force use of the optical 3x lens, the scene has to be bright enough for the camera to tell it would result in a better image than the digitally zoomed wide lens
<<
I used the same trick to 'force' Camera sticking to 3x lens in several indoor and outdoor scenes.
Here are two sets of photos just shot a few hours ago at two scenes. In each set, one was taken in full auto mode and the other one purposely dialed down 1/3 or 2/3 EV.
Both photos in full auto mode was siliently switched to 1x lens and zoomed to 3x.
Both photos with dialed down EV sticked to 3x lens.
They also manifest IQ discrepancy; the darker pair may be a little more noisy but are way better in color reproduction, texture detail and outline definition.
Set 1:
A: -0.3 EV, 3x lens as selected
https://www.icloud.com/iclouddrive/0j9CoQdNGrwF-yJxZdk35ikNg#IMG_9261
B: full auto mode, switched from selected 3x lens to 1x lens behind my back:
https://www.icloud.com/iclouddrive/0KqZV4yysEvW_TCiIH94exMDg#IMG_9258
Set 2:
A: -0.7 EV, 3x lens as selected
https://www.icloud.com/iclouddrive/0j1rwAXs4pWjR51DtImeUMAPA#IMG_9252
B: full auto mode, switched from selected 3x lens to 1x lens behind my back
https://www.icloud.com/iclouddrive/0z1BXbb-y62fOaYFgf3TVuFcQ#IMG_9251