The screen would probably be too small and I think there is a bit of delay, not sure if it would work peer to peer (no wifi router). Try it an let us know how it works. I was thinking about doing this with my iPad, but those 7 inch USB monitors are only $100 or so and has little latency. I'm waiting for someone to offer tuning over the internet. He taps into your PC (wireless cell) remotely from the office, directs the rider, makes some adjustments......
ive seen polished stainless bar mounted phone holders for iphones and android on ebay recently, they didnt look to bad a quality either
Team Viewer which is another good little program for this Iphone has a free app, our IT man at work use it for off site work to our computers when there are probs. I scared the shit out of the misses with when I went out & left he laptop going & things started happening. Ram mount has a few phone cradles as well, I have the Iphone mount on my SG & it works well.