Hey there!
You're not the first to ask for a trans start. Orientation week wasn't designed with this in mind at the time and therefore a lot of its artworks don't have variants to support it.
However, we've been working towards providing a trans start and reworking the early game artworks and scenes to support it. It will take some time before we enable this feature as we still have a lot of artworks to go through but rest assured that it is being worked on.