Flyheli,
I am sure that what you need has been done before but I doubt very much that any Pt 135 operator would do that unless they know the individual very well. It is not a question of $$.
Aside from the amount of admin, training, testing and supervision, the certificate holder would be assuming responsibility for your operation and would effectively be setting you up as a competitor. Why would he do that?
A single pilot/operator, Pt 135 is relatively simple to set up, however, it could take up to a year depending on how busy the local FSDO is.
I would recommend you have a look at setting up on your own.
I hope this helps.