I'm aware that this is an old post, but I think that framebuffer (displaying "only" eFB) would be possible if we make the xFB match the eFB resolution, right? I think evWii can do this, but not sure if it works like that. I think the resolution there need to be set 640x448 to match the framebuffer, but I'm not sure, I don't know why it's 448 instead of 480.Framebuffer: I don't think so.
Deflicker: ROM hack. Don't have exact steps but what I understand from https://gbatemp.net/threads/possible-to-disable-the-wiis-de-flicker-filter.477163/ is that you need to use wiiscrubber to extract the main.dol from the .iso, then hex edit it to disable the deflicker and finally reimport that into the .iso.
Note that I never did this nor did any other Wii ROM hacks, so all I said is highly theoretical.

