It would be nice to see opsi boot-cd available on boot.netboot.xyz here are isos available.

https://download.uib.de/4.2/boot-cd/

Mainly this iso contains kernel (vmlinuz-x64) and miniroot initrd (miniroot-x64.zstd) with following kernel parameters:

boot=lang=en video=vesa:ywrap,mtrr vga=791 service