Ok, so it seems a few of my previous tests were a bit flawed. It looks like vt.handoff=1 does the trick completely for this particular bug. So once we switch grub2 to vt.handoff=1 this bug here will be fixed. Another thing that needs to be still considered is somehow tweaking netboot installs to have 'splash quiet' removed - but that's a separate story.
Ok, so it seems a few of my previous tests were a bit flawed. It looks like vt.handoff=1 does the trick completely for this particular bug. So once we switch grub2 to vt.handoff=1 this bug here will be fixed. Another thing that needs to be still considered is somehow tweaking netboot installs to have 'splash quiet' removed - but that's a separate story.