> - Replace GRUB with something more modern like rEFInd or Clover with a nice looking theme.

Replace Grub with nothing. If you're not doing bootable snapshots like openSUSE, then there is virtually no benefit in a "boot loader". The linux kernel + cmdline (+other stuff like ucode or secure boot signing stuff) can easily be packed into a single bootable .efi file.

That efi file will then get an entry in your uefi boot device list just like windows already has/had. This way is better anyway, since windows will overwrite your uefi boot order with every significant update, meaning users will already need to know how to boot other os's.