Well Hirochi is the closest to Mitsubishi. And Arima is closer to Toyota. So I dunno. Maybe Arima could work, but not 100% certain, plus you’d need to ask Docroswagge for permission.
I've used "Matsumoto" in the past on Mitsubishi inspired liveries. It's a city in Nagano Prefecture, Japan and can be used as a surname. The city's official seal could be used as a manufacturer logo, and would look a little bit like the Mitsubishi logo if you coloured it red.
I've never seen that logo before, it's not the Matsumoto seal, no. You can find an .svg of the seal on Wikipedia, super useful for making a logo out of it. Matsumoto, Nagano - Wikipedia File:Emblem of Matsumoto, Nagano.svg - Wikipedia I have a rough .png of just the symbol, which you (or anyone) could totally use if you want.