I could not archieve this, things I tried:
- Just leave free space on the drive and allow Bazzite installer to do its thing. This leads to end up with Grub with only Bazzite on it, can boot Bazzite. Could not add OpenELEC manually, doesn't seem to be detected. Could not add it later automatically asking group to reconfigure.
- Create a partition for bazzite and let the installer reuse the efi partition without formating it: This leads to end up with Grub with only Bazzite and cannot boot.
- Create a partition for bazzite and another efi partition for bazzite ... but the installer still wants to "mount" the original efi partition?! I give up.
Under any case, if every OS requires its own EFI partition so they don't step on each other is fine, I can select the one to boot from the bios but the installer seems to be giving me a hard time just to get there.
I'm aware that Bazzite has KODI on the app shop ... but sadly with Bazzite installation I could not get most Blu ray menus to play, this is a problem I don't have with LibreELEC. I'm guessing a Java Installation and Plugin for KODI issue.