Way beyond IMO. A OC in a hypothetical linux mode would be a stretch. Tinkering with the processor while the WiiU OS has priority running a game as intended is even more unlikely.
Best bet if you need that FPS fix is do it on CEMU with in a few months/years, it will accomplish this task long before this project would get off the ground.
Nothing is impossible but even logical homebrew/apps are scarce and seem somewhat abandoned, safe bet is you will never see this.