I would guess that 90% of the guys here on this board thought their head shape was too odd to shave smooth before they shaved. The truth is, nobody has a perfectly shaped head. We all have bumps and ridges.
So, back to your question, I suggest you start with the buzz cut. Give yourself some time to adjust and for family and friends to adjust, and gradually take the buzz shorter. Then one day, take the razor to it and it will be a non issue. You will love the smooth feeling of the razor blade shave and your bald spot worries will be over.