I actually do too
OK so for this we have to talk about what force widescreen and force progressive actually do from a technical standpoint. Force widescreen does not use a higher resolution to get it to display more but changes the internal apsect ratio floating point variable the game uses to then create the picture you are seeing on screen, essentially squishing the picture into that small 640x480 resolution which then gets stretched out on your TV.
Force progressive also does a relatively small change to the game, on gamecube and wii the difference between progressive and interlaced comes down to a variable within the video setup done by the system. So all really done to games which normally cant do progressive is change out that value before starting up the game.
Now everything after that point runs on the original GPU from the gamecube/wii, that GPU only has support for a resolution up to 480p at 60fps or 576p at 50fps, after that point every other setting will be invalid. On a wiiu they even kept the original GPU just to be able to display all of this, their new GPU uses a API called GX2 wheres the original one was GX on gamecube and wii, and that from at technical standpoint has nothing really to do anymore with that. Now if we would want to run nintendont in wiiu mode we would not just have to emulate GX graphics but pretty much everything else too because basically everything changed and nintendont itself would not be enough for that job anymore, you would have to think of a entirely different system.