Before you try to get two more people on board, put it in a call to BVIYC and see if they'll work with you -- they have some great monos that would be perfect for 4 if they have availability. They have a great 46 "DeeDee&Zeus" that has a generator and A/C -- we chartered "Tootsie" from them last May - she's a newer Oceanis41 - great boat - shoreside A/C only - not sure if that would be a dealbreaker for you or not. Call them sooner rather than later if you're wanting to change plans -- they book out pretty far in advance since they're a smaller outfit.