It's something I would've liked to have seen in Shinkenger: a full-blown feudal war set in the modern era, with the Kurokos doubling as house guards, ShinkenGold as a warrior monk or something besides "proto-Gai wannabe samurai", etc. I guess Gaim is sort of doing that though.
We could then have the crossover with Jetman and Dairanger featuring bad CGI versions of the Jet Machines and Kidenjus
Their weapons would be farming tools, their mechas farm vehicles, and their villains anti-environment corporate developers. At least that's what Toei would probably do: I'd personally want to have more of a feudal Japan feel with Ikko-Ikki warrior monks and Shinto/Buddhist imagery rather than being completely obvious.