ngophotographer

I have just arrived in Australia (Sydney) from the UK (London), and have some similar questions to this. In the UK, I was a limited company director (no other employees) and paying myself a £736 monthly salary and the rest in dividends (of which there were none in the last year owing to Covid). In Australia, I have set myself up as a sole trader and already have my TFN and ABN. I am wondering how I can ensure I register a 'full year' for National Insurance purposes (to protect my State Pension in case I return to the UK one day). HMRC told me I can continue the £736/month arrangement even after emigrating, but this would seem tax inefficient to me because I would then get taxed on that amount in Australia (unlike in the UK, where that amount came under my personal allowance). If I strike off the company now, could I pay voluntary NI for the rest of the year and ensure a full year? If I do that, would I get into a complex 'split year' situation? Any pointers would be warmly received! Thanks in advance.