If I may suggest a deviation, I think more along the lines of a "Old Tom-and-Jerry/Looney Toons-style Wario RPG" might work better.
Like, this is specifically more of an art-style and tone sort of thing. Because Wario does sort of act more like a cartoon villain, and it'd be interesting to see a game that sort of tries to emulate the feeling of an over-the-top evil guy trying to set off his tricks. Or at least, a Evil dude trying to be Evil/Get his fortune deal. Wouldn't need to be complex at all.
I feel like the deviation would at least distance itself away from Paper Mario's sort of JRPG tone enough that people could judge the Wario game on its own merits? Art style goes pretty far.
(Also I remember back when I was younger, I found a weird Paper Wario game on Scratch. It wasn't very good, this thread just made me remember it.)