When you look at this thread, you will see that I had kind of the same idea few weeks ago. The problem is the clients phone has to be on all the time and he needs a lot of data, unlimited even better.
Allproxy is a real innovation, with few adjustments/ideas it could help a lot. Sadfully the creator of the app got banned from here until October. Sure, he spammed a bit because he posted kind of the same thread multiple times but the app and the idea behind it is amazing!