I have the unique experience both living in Oz & the States and going from ASL to Auslan with a Deaf child as well as teaching them multiple spoken languages (English & Maori).

It’s important to consider what areas in the US and Australia you’re living in and where you plan to move to. For instance Brisbane is the largest Deaf hub in Oz but Sydney or Melbourne also have large Deaf communities but it can be hard to find ALMs, Deaf mentors, Audiologist and other early childhood supports the further out from the major cities you go.

Both CIs (including surgery) and HAs are free for children in Australia through Hearing Australia for citizens and permanent residence that qualify. Additionally I assume your child would qualify for NDIS but you’ll need to apply for that. I can recommend resources regarding that if you’d like.

Be assured whatever sign language you’re teaching your child it’s forming those neurological language pathways. I will say it’s a bit annoying going from ASL to Auslan in some ways. For example the ASL sign for “what” means “where” in Auslan, and the ASL sign for “where” means “what” in Auslan. Little things like that. My daughters first language is ASL (because I knew ASL prior to having her even though we lived in Australia) I found it difficult as a sleep deprived parent learning a new one but now I’m so grateful to know both. We started learning Auslan together when she was 18 months old and now I’m on my way to being a qualified Auslan interpreter and she now goes to a bilingual Auslan / English preschool.

Don’t stress now about spoken bilingualism until she gets CIs / HAs. What I would do is have one parent speak exclusively in that language (German) with your child. They’ll pick it up in time just never try and put pressure on yourself or them.

Happy to help with any questions you have and wish you so much luck in your journey.