Hi!
Happy to hear you like the customization :D It was a lot of work. For your question, I am copying what I said on the blog about this:
"
The current plan is that once MC is an adult, there will be an option to choose who you have grown into, similar to the initial choice in the first interlude, none of them locked based on your initial choice.
It will of course be a long time before we are there.
"
There is a bit more explanation at the blog.