Nandroid backup/restore alternative(s)?

I'm running Android 13 on a device for which there is no TWRP nor OrangeFox recovery module: it's a Pixel 7 Pro. I'd like to perform the equivalent of nandroid backup/restore, and I'm wondering if there are any ways to do this. To be clear, I'm not looking for any "backup" apps (*e.g.*, SwiftBackup, TitaniumBackup, *etc.*) which only back up apps and maybe call logs and messages. I want to be able to back up and restore all the OS partitions such as /system, /boot, *etc.*, which a working nandroid implementation can do. I know that partitions can be backed up using dd-based methods, but if I take a dd backup, then upgrade my OS, and then decide that I want to return to the earlier OS, I can't use dd to restore, because the encryption would have changed. Is there perhaps an EDL-based method for doing what I'd like to do? Thank you in advance for any ideas and suggestions.