@wiak I thank you allowing us to see your steps to SUCCESS and the advice of the things that could hamper booting a KL series distro. Your depiction, IMHO, is EXCELLENT.
Further and MOST important is that YOU HAVE GIVEN THIS FORUM A VIDEO for use that leads to success in booting ISO files via the Ventoy "ISO lister" USB! That video is an excellent way for a user to follow visually seeing successful results.
Wonderful documentation for member use!