Hello, no way to get a working USB key or working installation.
I created several times the USB key as said in post #1 using Clover_v2.4k_r4961-UEFI.pkg, it boots and works with Mojave partition, but I cannot start Catalina external (USB) once.
I created SSDT-EC.aml and paced in ACPI/patched folder (IoRegistry shows EC item), I placed in kext/other latest version of FakeSMC.kext (but tried a lot of combinations using also lilu, USBInjectAll and WhateverGreen), tried with config.plist from working Mojave partition and from post #1, tested many boot options (disablegfxfirmware=1 / nv_disable=1 / slide=0, shikigva=1) but without results.
Any idea? I disconnected every SATA device, and I am using English language. I only have some USB device connected, like webcam and Logitech Unifying Receiver.
Strangest thing is that the first time I created the USB key, it worked, and I installed Catalina, but with audio and Bluetooth issues. So I am sure BIOS setting are right. But now I cannot install it any more (and I deleted the whole HD).
I also tried upgrading from Mojave, but I get an error loading kernel cache after reboot.