Personally, I think it would be sweet and in-character for Hannelore's friends to decide that they don't want her to forget them. So, every now and then, one of them will send her a long text updating them on the latest events (e.g.: "So, Faye's little sister just 'dropped in' and you'll never guess what happened next!"). The strip will always end in the same way - a silent panel of a smiling (perhaps tearful) Hanners reading her 'phone screen with a different background every time like Angor Wat, Oxford, Machu Piccu, Nazca, El Dorado, K'un-Lun, etc. Maybe for laughs, in the background Winslow running away from the local headhunter tribe (location-specific every time).
Or maybe: "I wonder what Hanners is doing right now?" Cut to her in a yoga position atop a 10-foot high pole, having a cup of tea with a monkey dressed as a sage or sword-fighting with a half-dozen ninja.
Or, for maximum freak-out, an anonymous figure in black standing on the roof of a skyscraper in the same city as ECE's headquarters with the following text in yellow narration boxes: "Dog carcass in alley this morning, tire tread on burst stomach. This city is afraid of me. I have seen it's true face. The streets are extended gutters and the gutters are full of blood and when the drains finally scab over, all the vermin will drown. The accumulated filth of all their sex and murder will foam up about their waists and all the whores and politicians will look up and shout 'Save us!'...
"...and I'll look down, and whisper 'No.'"
Last panel you see it is Hanners wearing a black hood and a domino mask, reflected in Beatrice's office windows.