If you're going for secure boot, I'd advise against GRUB.
Use an UKI, dm-verity and get one part of your disk encryption key from your TPM 2.0 (choose PCRs carefully). Is that not compatible with timeshift?
Also see safeboot.dev, even if that's just for Ubuntu 20.04.
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Any setup where the kernels aren't stored on the btrfs root does not give bootable timeshift snapshots. This includes UKI.
Just edit the source code and recompile bro /s
Dunno why this is downvoted, this is unironically a last resort of mine. I don't want to maintain a fork of grub but if it comes down to it, I may do something similar to this except the sed trick doesn't seem to work anymore.
EDIT: sed trick does work. I just forgot to install grub with --disable-shim-lock
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Maybe they are downvoting because I used /s? idk lol