That's ok like I said not the end of the world in fact go back to the part where I suggest not having a spirit for the MC this still allows us to project and it saves you some work. When it comes to CGs that may have the MC just do what the original Morenatsu did and have the face of the MC conveniently facing away or out of frame. If you do go this route one thing you can do is allow the player to make simple customization like skin tone and hair color similar to what was done in extracurricular activities.
I don't think you should bog your self down trying to make the MC super customizable but something as simple as a color swap for the skin tone and hair can make the game much more enjoyable. This allows people from different ethical groups to also project in ways they may not get to in other VNs.