With zero data loss a Ubuntu 22.04 FDE (LUKS) drive can be converted to boot in a UEFI (non Legacy Boot) system. The LVM partition is left complete untouched. The boot partition is resized to give room for the EFI partition.
Make a full backup of the drive. The partition table is getting totally rewritten which means data could be lost.
At a minimum backup the partition table of the drive:
sudo sh -c "sfdisk -d /dev/sda > sda.mbr.backup.sfdisk" #backup partition table
sudo sh -c "sfdisk /dev/sda < sda.mbr.backup.sfdisk" #restore partition table