Including their face.

I don't think this is necessary. What does seeing an officer's face do that a name and badge number doesn't? What about undercover cops? What about the winter when it's cold?

I think it should only be required that they declare on what authority they're acting when making official actions, like a stop, detainment, or arrest. They should give their name and badge number upon request, in a form that works for the asker (written or verbal, asker's preference).

If we ban law enforcement from wearing masks, that opens the door to banning masks in public. I get that police should follow higher standards (I'm absolutely in favor of ending qualified immunity), but IMO the rules should merely be that police must self identify in a way the public knows they're legitimate law enforcement when using the authority of their position.

Every officer has a badge number that uniquely identifies then, and they are legally required to provide that information. When filing a complaint or a lawsuit, you'll provide their name and badge number. If they refuse, you provide as much information as you can (area, time of day, type of vehicle, vehicle number, other officers and badge numbers involved, etc) so they can track the officer down.

I don't know how ICE works specifically, but many police departments require their officers to carry business cards with that information and hand them out upon request.

Civilians have a right to verify that the people involved are actually officers and have a right to identify individual offices to report misconduct.

I don't care if officers wear masks, I only care that they can be uniquely identified.