Using tethered data for a specific program

Hi,
I have a question that involves my Macbook and tethered data through my iPhone. I'm not sure if this is the right forum but have placed this topic here because of it's relation to hacks and the iphone (I'm using MyWi through a JB idevice)... if the mods think its better placed in the Macbook or other forum please feel free to move it.

I wanted to enquire about using my tethered data for portions of my computer (ie using the tethered data for particular apps) while letting the remainder of my usage proceed normally though either a wireless or wired internet connection. I use MyWi either through bluetooth or USB tether so there is no issue with trying to connect to multiple wifi networks (mywi phone and regular wifi).

I work at an office where I virtualize and run windows (parallels, windows 7 professional) and need the office's wifi network to access corporate shared drives etc. I want to be able to have either:
A) all data from the mac side run through my phones tether while connecting my virtualized windows to a wifi network
or
B) dictate specific programs (ie Apple Mail, chrome etc) to use the data connection from my phone while everything else (including parallels w/ windows) uses wifi

I'm interested in doing this so that I can keep my personal email from passing through work servers where it is subject to fairly heavy monitoring.
Any suggestions or tips as to where I should start on this would be appreciated!