..snip..
> > Now in the process I discovered that my patch for grub-mkconfig to
> > detect multiboot2 payloads and use those instead of multiboot never
> > made it upstream, so I had to modify my grub.cfg by hand (see below).
> 
> It will be nice if you post it after GRUB2 2.02 release.

OK, I will wait (but attaching it here).