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One thing that comes to mind, if a call comes in accompanied by screen message of a kind that I have never seen before I'd be twice as alarmed as with just some random unknown number calling. I might end up googling recently updated apps for news of a malware takeover instead of answering the call.

But it would be a good idea nonetheless, it only requires to be accompanied by a serious information campaign preparing first time receivers for the surprise.

Semi related, but some services (trapcall, for one) offer a very cheap service that punches through called ID spoofing via AMI, and offer blocking on public and private lists, really help.

I believe they already do this.

Then why aren’t pollsters and contact tracers doing this so none of miss those calls?

I don't want pollsters calling me. Nor contact tracers. They can send an email if it's essential.