Whilst I do not recall someone creating a project exactly the same as yours, there were a number of people on the former RealSense forum who used mini-boards such as the Intel Edison board in conjunction with a RealSense camera to do tasks that were not supported by the RealSense SDK on its own. A mini-board would be likely to be your best chance of interfacing with a smartphone in this way (Edison supports both wi-fi and Bluetooth).
Here's a useful guide to interfacing RealSense with an Edison board. It may give you some useful insights about how to take your project forward.
The guide references the older F200 camera. SR-300 is the next-generation replacement for the F200, so the details in the article should still be relevant.