Have you tried the new kodi remote? Looks like it's a new redesign as of last fall. Not sure of the functionality you described but I know there is a text feature. I thought it was something to do with manually sending a text message to the target screen, but what you describe makes a lot more sense.IMO Yatse is by far the best Kodi remote. Honestly it is my favourite Android app.
If I get a phone call my show/movie automatically pauses. If I get an SMS or Facebook Messenger alert it scrolls at the top of the screen. I can stream from Kodi to my phone, or to a Chromecast. Bunch of other neat features.