Honestly, I think that if you're asking this questions, you should be hiring someone.
Personally, I would just pop a hole in the wall below the range plug, install a second range-plug box as a brew plug and run the wires in parallel from the range plug to the brew plug (inside the wall, of course).
Be careful of your total power requirements, you may overrun the breaker if you've got the oven and stove on and you're trying to run brew equipment.
Alternatively, clip another breaker into your breaker box and run a fresh wire to your brew room and install a plug.