I'd prefer a slice of life WarioWare anime. Just look at how good the cutscenes for Shake It were. Even though I found the gameplay boring, you can't deny how good the animation looked. A WarioWare or Land anime would be sick!
Animation, comics, and books are better formats for video game adaptations. Similar to what you said, these live-action adaptations of games and live-action remakes of animated shows/movies just look awkward and uncanny.
A WarioWare adaptation...
It's not much, but it's pretty neat, especially given that the mansion looks suspiciously similar to her mansion from WarioWare Touched/Smooth Moves as well:
So, any other cameos in the game so far?
Hells yes. And I think they already are. Just look at Metroid Dread and the newest StarFox game. It's a great way to give the die hard fans more replay value.
Looks pretty professional to be honest:
https://cults3d.com/en/3d-model/game/mona-from-warioware
They also made Jimmy T as well:
https://cults3d.com/en/3d-model/game/jimmy-t-from-warioware
As well as Captain Syrup from Wario Land:
Not your fault, Chris Pratt and Charlie Day lied to us.
It's super bizarre how scarce Wario news is now. Especially since Nintendo brought back WL4 and World last year. I really thought that was there way of hinting towards a new Wario game.