Just received my email in the last couple of hours approving my Swiss EU-DCC via the free Geneva option. Downloaded the PDF and imported in to the app, looks all good to me.
I note that the certificate is valid 270 days from my last vaccination (which was on Monday) despite being a booster. Hopefully we won't need further jabs and Australian certificates will be valid for scanning etc (if still required in EU) by then.
Thanks to the posters in this thread for the great info on how to apply (particularly the Geneva method).
Edit: Forgot to mention, for reference I used a flight booking as evidence of travel to Geneva. Not sure I will use the flight as I might now fly in to Zurich and then go to Genvea by train.
Just to highlight the benefit of issuing these certificates, I was not really interested in visiting Switzerland this time around but now I will spend up to a week there just because of how convenient this process was. Compared to visiting any other EU country where getting a certificate is absurdly difficult (if not impossible).