Not anymore!
I just successfully installed your 3rd non-Samsung CustomROM.
By the way:
The file vendor_boot.img is included in file payload.bin (extracted from e-1.16-t-20230926-UNOFFICIAL-Spacewar.zip by roonz98). A detailed test with screenshots will follow as soon as possible.
@ronnz98, congratulations and very best thanks for your first class work 