200R4 update

Hate to stray from the original topic, but if I wanted to use a 200R4 behind a stock Magnum 5.9 (externally balanced), how hard would it be to either procure a custom flexplate to mate the two together, OR redrill the Magnum flexplate to match the necessary 200R4 torque convertor? Anyone been down this road, or something similar?

I'm getting a 120K Magnum 5.9 that I don't want to disassemble and internally balance, and trying to figure out the best/easiest way to do this.

Sorry to step on toes -- I can start a new thread if necessary.