the mosfets are logic level p channel mosfets that are controlled by the pic, thus IMO are not overkill.
I need to adjust the resistor values accordingly but this is a starting point. The 2k pot is for fine adjustment if desired. Thinking of putting a resistor in series with the pot to prevent the LM317 adjustment from going too low.
Plan to use two tactile switches for UP/DOWN to select desired voltage. For accuracy, 1% resistors should be used as well as add more steps.