Apparently you can compile ShowMiiWads with Mono -> https://gbatemp.net/threads/an-alternative-to-showmiinand-for-linux.206932/
Alternatively, you could try it under the latest version of WINE. People report it crashing when installing WADs, but nothing bad about extracting them. It's worth a shot.
Alternatively, you could try it under the latest version of WINE. People report it crashing when installing WADs, but nothing bad about extracting them. It's worth a shot.