Yes this will work... And pretty well, IF you can live with the (only) wifi connection. If you are around wifi when you want to take or make a call or text, all will work well. If you can't be around wifi, then the experience is less. One solution: a Mifi device, so you can take your emergency backup wifi anywhere. Turn it on when you need it and that works very well.
Suggestion: ipad mini with LTE. That's still portable and, effectively, has the " Mifi" built right in. I use that with talkatone and earbuds with microphone and all works very well.