But, how about backing up just the boot sectors / EFI partition with a dd command and then just restoring it again? Not a slick solution, I agree
Unfortunately that does nothing on a UEFI system. There’s no boot record any more (just a partition table) and even if there were (ie it’s an MBR drive instead of GPT) it would be ignored under UEFI.
But in the case of rEFInd and GRUB, both would actually happily live side by side, what’s changing is just the default bootloader selection in the UEFI. So all you need to go into your UEFI settings and point it back to your choice of bootloader. No need to worry about reinstalling the bootloader, messing with config files, etc.