Setting up a Full Disk Encryption on Ubuntu derived distro's is easy, because Ubuntu's installer simply provides access to all available partitions on all available disks from within the partitining part of the installer, this includes averything from /dev/mapper. The pre/post - setup parts can be done via a terminal.
This is sadly not the case for the majority of distro installers. Some, like Fedora, tries to provide automated features within the installer, sadly it does not work properly. Others are much more limited by not including anything from /dev/mappper and some not even allowing more than one disk to be used.
I tried installing Solus Linux to day, which turned out to be yet another distro with a limited partition setup. It only allows one disk to be used when selecting mount points manually and these partitions does not include /dev/mapper devices which in turn means no encrypted or LVM volumes.
So if I choose to use "/dev/sda", I can only use "/dev/sdaX" block files for mount point selection. If one of these is an DMC/LVM, the LV's is not included.
If I where to create a small additional partition on "sda" like "/dev/sdaY", is there a way to link that block device file to another device file in /dev/mapper? For example
/dev/sdaY -> /dev/mapper/lv-system
Kind of like "mount --bind" for folders. Or some other way to trick these limited installers into using a different device file?