It’s really funny to see everyone here fish for reasons this can’t work

Actually, if you read either of the links provided above, you’ll see that that’s exactly what happens

Yes, that’s definitely sensible and doable

They definitely want your photo. They will photograph / scan your face everytime you fly.

This is already the case.

How does one fill them in without it looking like you have a mess of glue on your fingers

A simple layer of superglue.

Sadly I must sign up. I have managed to avoid it for many years, but it’s a requirement for my work.