No, there's no way to do it.
Nintendont was originally planed to be integrated inside existing loaders, not being a standalone interface. it reads externally generated settings to know which game to launch and which settings to use.
you need to use USBGX or wiiflow if you plan to use different settings per games.
Currently, USBGX can be used as WiiVC but has these issues :
- it's forcing a reload to cIOS, losing AHBPROT info. as a result, the "banner layout channel" is not available, and some menu are missing textures read from NAND.
- no WiiU Gamepad support inside USBGX interface, but once a game is launched the gamepad works fine.
- No idea what happens when you try to exit a game. (it will try to reload a vWii channel, but can't find it? or maybe nintendont exit back to wiiu menu correctly if WiiVC is detected)
I see you found my post about the widescreen

I hope it was interesting to read and easy to understand. it's not always easy to differentiate buffer vide width and output video width.