I've got the Android Rookie Edition (patiently waiting for petrolhead/GP edition

I've got a RoadHawk HD dash cam that I use for road and track day recording. I have recently also downloaded the Race Render 3 software.
Is it possible to have the stand-alone video running, then my Android phone running Harry's laptimer (connected to OBDII reader) then using Race Render 3 (or is there better choice?) overlay the data from Harry's Lap timer to the video in post processing?
I guess I have to wait for Petrolhead/GP edition first? Am curious if others are doing this as the video from mobile phone isn't great.
Looking for the best/easiest solution for getting the video + data together after being saved seperately (data to phone, video to camera)
Thanks
Tom