@Junkhacker Wow! Thanks for the hints! I’m trying out tomorrow if there are easy changes for me or not :) But with that said year, should be possible. I already build the normal PXE Menu:
DEFAULT menu.c32 PROMPT 0 MENU TITLE Test Boot Menu TIMEOUT 100 LABEL netboot kernel ... initrd blablabla
so maybe I’m able to chain it to that menu. Since I never used iPXE I have to investigate.
But thanks again for your help!