I've tried to set up rEFInd but couldn't get the proper configs / kernel parameters work for my LUKS-enabled setup. If you're willing to try another loader out, I was able to make systemd-boot work with both plymouth (flicker-less loading), luks (with graphical prompt), and secure boot too.
Oh man that sounds like exactly what I'm looking for: dual-booting two distros, one encrypted, all with secure boot and a nice graphical boot process. I just went through the fiasco of rebuilding my EFI partition and grub setups. Is switching to systemd-boot much harder?
Follow the Arch wiki. Just make sure that your distro has a hook for the package manager for signing the kernel. Eg. for Arch there's the systemd-boot-pacman-hook aur package.
It's not hard to set it up with a LUKS-enabled system, just put the relevant kernel parameters in your /esp/loader/entries/entry.conf file.
For example, here's my arch.conf entry (with LVM on LUKS):
title Arch Linux
linux /vmlinuz-linux
initrd /intel-ucode.img
initrd /initramfs-linux.img
options loglevel=2 quiet splash cryptdevice=PARTLABEL=partlabel-from-blkid:pvname root=/dev/mapper/rootlvname rw
If your keys are already enrolled, you can just use sbctl sign-all once, your package manager hook should do the rest.
Overall, the general directory structure should look like this in the end (files omitted):
/boot
├── initramfs-linux-fallback.img
├── initramfs-linux.img
├── intel-ucode.img
├── loader
│ ├── entries
│ │ ├── arch.conf
│ │ └── arch-fallback.conf
│ ├── entries.srel
│ ├── loader.conf
│ └── random-seed
└── vmlinuz-linux
I haven't seen this one before but now I have to thank you for bringing it to my attention. I'm gonna try and find some time to apply it to one of my devices and see if I run into the same flicker issues with Debian/Mint systems
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