My GP reccomended that I lodge the referral, progress with the antenatal care and not mention the homebirth. Just stay home come labour time.
Sara, i would start with this plan for now - lodge the referral and see how you get along with that process. You will know if that way is going to work for you, and you don't want to miss out if you decide later that is what you want.

At the same time, start chatting to midwives and see if you find one (or more) who you want to work with.

Birth registration is really a minor issue that you can work out later, especially if you already have a GP who you can see during the pregnancy.

At the begining of my pregnancy, i was talking to my IM but also going the birth centre route. I was able to access the 20 week ultrasound through the birth centre, but the other benefit was that i discovered i was sure that i did not want to birth there.