Hi!
A while ago now, did you found what you wanted?
We're just finishing an Ionic app (hybrid/native for iOS, Android, web etc) for use with our hosted Kazoo platform. For now it can handle the basic user functions (CDRs, login/ out of ring groups, call forward etc), but also a function to dial from mobile through the PBX (calltrhu or callback) and push notifications (get a notice before your mobile is ringing, showing who's calling and where, before you answer).
We've also developed a time based presence functionality ("The user you're trying to reach is in a meeting and will be available at 12:00" etc), available both from extensions and the app.
If you're interested I might send you a demo?
We're also based in Sweden, as the example you linked to (Guess you're from Denmark, right? )
Br - Tomas