You own a game? Make your self happy and play SMG on Dolphin with all the bells and whistles enabled (if your PC allows it). Connecting Wiimote is also not too much of a hassle, you just need proper bluetooth dongle.
When it comes to emulator itself, from moral stand, it's up to you to decide...for example, if you bought your Wii second hand, Nintendo wouldn't see any money from hardware whether you own it or you play your bought games on emulator...and if you bought your game second hand, they wouldn't see any money from game either.
From legal point...no idea, but this guys have been selling DS emulator for years on PlayStore for $5, and Nintendo either didn't or can't do anything about it:
https://play.google.com/store/apps/details?id=com.dsemu.drastic&hl=en







