Is mouse and keyboard too supported? I would like to use it with an dongle.

*should* be. Mouse support on VO was updated recently to better support chromebooks, while keyboards have always worked in my experience.

Now, if you can OTG both of them? I don't know anything about that, how android will handle that or not, so be sure to come back and let us know?

I will test it in the next weeks and report it back.