Setting up relative path to deployment share

I am trying to execute MDT 2012 task sequence from local system as an offline media. There is a twist in requirement wherein users are copying offline media to USB or local drives (root of any drive) and running batch file to call LiteTouch.vbs. Since the process is independent of IT support personnel and no recommended guidelines, my deployment share must be able to run from any drive location instead of being a static path in bootstrap.ini. Present bootstrap.ini as below.

[Settings]

Priority=Default

[Default]

DeployRoot=C:\Content\Deploy

SkipBDDWelcome=YES

UserID=none

UserPassword=none

UserDomain=none

 Any thoughts on setting the relative path to deployment share?