The obvious question is WHY? Is there an issue with your current board?
If not what are you trying to improve/modify or control the WEGA brain doesn't? If you are wanting to try and tighten up the brew temperature range for example then an electrical only solution is not it. Tuning of HX loops in conjunction with say a PID is black magic to get an 'improvement' and playing with orifice plates to adjust flow is as much or more important.
Even then this 'improvement' is driven by the Beans used, how they are treated and the mug on the knobs skills and the tastebuds of those drinking it.