A: Yes! A popular ROM hack called "Mario Party 8: Gamecube Controller" exists. This hack disables the Wiimote and allows you to use a GameCube controller, though it may have minor issues like the cursor getting stuck near the screen edges and no control deadzone.
The WBFS format strips away the "dummy data" (useless padding) from the ISO. Converting the game to WBFS shrinks the file size significantly, saving precious storage space on your SD card or external hard drive without sacrificing any game data, video quality, or audio. Core Gameplay and Legacy Mario Party 8 Wii NTSC-WBFS
: You'll need to download or obtain a copy of Mario Party 8 in NTSC-WBFS format. Be aware that downloading games you don't own can violate copyright laws. A: Yes