Current Status: I could finally download the installer with gibMac and create the Catalina-USB bootable device. I created the opencore bootloader, mounted its EFI partition, copied the modified EFI files into the EFI partition.
I set the BIOS parameters, disabled the CFG-Lock (I´ve got F2 BIOS version). Rebooted and I got to this place. It´s been stuck for a long time now... more than 40 minutes. Should I try just rebooting or still wait? Sorry, but I don´t know long I am supposed to wait. Bootloader is in a Sandisk Cruzer 16gb connected to the red USB 3.2 and I´m trying to install into an NVMe Corsair 480GB mp510.
Any assistance here would be awesone!
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