I'm definitely thinking it's a possibility for the reasons you say, absolutely. I DO say that yes, if Geno's missing Mii costume is a point for Geno, why not Monster Hunter?
Monster Hunter is like, another Dragon Quest level hit among Japan. Plus I mean, we have two Monster Hunter musics, a boss/assist trophy, and even the Ancestral Steppe (?) as a stage where you fight said boss. The only thing missing is a Fighter and a series logo.
Plus a Monster Hunter Spirit Board is like... something you could do a TON with.
ALSO. If we wanna get SUPER CONSPIRACY THEORIST in a way that may point to nothing at all.
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IF... gigantic if, IF Daisy Glitch is meant to have been them testing something for some character (see some
papagenos
videos for more on that), then.... MAYBE? Particularly in regards to the Rathalos armor, the Mii Costume of which is still missing.