Just an FYI all, datel have released their retro collection of hardware, on their website you can now purchase what arrived for me last week, a microSD media launcher. : r/Gamecube
Play homebrew on your GameCube or Wii (in GameCube mode) with SD Media Launcher - Codejunkies
BitFunx SD2SP2 Adapter Replacement Micro SD Card Reader + Swiss Boot Disc Mini DVD For Nintendo Gamecube NGC Consloe
Amazon.com: Nintendo Wii Key SD Card Adapter (SD Card NOT Included) : Video Games
Can You Play GameCube Games on Wii U & How to Do? - MiniTool Partition Wizard
GameCube core - Cores - Libretro Forums
How to Play Gamecube Backups on Your Wii Without a Modchip. : 5 Steps - Instructables