You can use tablet talk
https://play.google.com/store/apps/d...pdroid.tabtalk
It'll do text messages, and show when someone is calling. You can even answer, text, etc, however it does not have the phone paing to the tablet.
When I did my tablet install in my NB miata, I had tablet talk, and an external BT speaker.
So if I got a text it would pause my music on the tablet, play a quick notification, and the text would show up on screen. Then music would continue.
If I got a phone call, again, the music would stop, the table would show the phone call, with the caller ID, I'd hit answer, then my BT speaker would start from there. And the best part? Music would stay paused until the phone call was over.
Back then I used an amp wire to my speakers, and from the amp would be a 3.5mm to RCA cable. I bet if you could get a 3.5mm splitter, and buy a BT setup
https://www.amazon.com/Comsoon-Bluet...dapter+for+car
And with a litlte more tooling, I bet you could get it all to work in conjunction together.