Okay, so for some this may not be any kind of surprising news, but I just noticed that the Nintendo Switch Joy-Con can be mapped together to work in SK. My Windows PC treats them as individual controllers, but it looks like SK doesn't mind accepting simultaneous input from two controllers anyway.
This might not be a surprise for those who knew that they connect to the system using Bluetooth (and because of that can be paired with a PC or Android phone), but it just seemed like an interesting way to play SK.
I'm sure the Pro controller works as well, and for most that may be better than using the Joy-Con, but it just intrigues me that you can use them. (I also can't test the Pro controller because I don't have one at the moment. :P )
I used to play with a PS3 controller and mouse to get analog movement and mouse aiming. It was a bit clunky naturally due to the PS3 controller being meant for 2 hands. I'd say Joycon+mouse could pretty damn good, definitely worth a try. SK plays really well with joystick movements and mouse aiming!