Just when I thought this case could not get any wilder.
In the podcast, MC says that her and the real FR divorced when she was 36, and she is 70 now. So that would mean they divorced in around 1988. We believe there is a family connection with MC and the real FR to Itzig.
In the inquest, DdH says that they were working in Itzig, Luxembourg for around 3 years in the early 80s - this is supported by the daughter being born in 1981 in Luxembourg.
I think it's absolutely plausible that RB had an affair with MC - perhaps during her marriage (although he easily could have returned to Luxembourg after), stole identity documents e.g. a birth certificate from their home and then used these to take out a QLD driver's licence, later placing the lonely hearts ad and scamming Marion. He might even have known about the football connection and used that as a line to gain her trust as another user suggested (e.g 'I knew your husband back in the day...)
Mind. Blown.