Done thanks to @tomchai video posted I have replaced the SIM card reader with the dual sim version bought in China. Software swapped from eSIM to dual SIM automatically I am using now the phone with 2 Sim, one European and one Vietnamese since last July 2022 without any problem.
From iPhone 12 you can easily swap the reader with a dual sim reader to have dual physical sim instead of esim on board. I did personally the change and iOS recognised immediately the reader without any issue on my iPhone 13