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by Sanddancer 3823 days ago
There is a board that'll pull hdmi to the CSI port. It's abou 150 euros, but there have been success reports, up to 60 fps

http://www.auvidea.eu/index.php/theme-styles/2014-12-30-22-3...

Regarding emulating a USB device, first thing that comes to mind is possibly using a micro of some sort that can act as a usb device, like an arduino or teensy. it's a bit hackish, but sending things over SPI should get more than ample speed for keyboard/mouse emulation, and there's code written already for a lot of micro platforms to do both.