No experience myself but theoretically this should work as Hivemind is based on Kodi: https://play.google.com/store/apps/details?id=org.xbmc.kore&hl=en

Might need some SW changes but is likely doable.

Personally I use desktop mode and one of these guys for my input depending on how much I need to type:

http://www.amazon.com/Lenovo-Multimedia-Remote-Keyboard-N5901/dp/B0036VO67I

http://www.amazon.com/Logitech-Wireless-Keyboard-Multi-Touch-Touchpad/dp/B005DKZTMG

You can also use any Media Center compatible remotes, and kodi can support just about anything: http://kodi.wiki/view/Remote_controls

It should work, with a couple of caveats.

1) You will likely lose the ability to turn the Boxee on using the menu key, or its equivalent on this new remote.
2) The Boxee native remote is RF, and therefore does not need line-of-sight to work. This one, being infra-red, will need line-of-sight. I guarantee this will cause problems when using the keyboard, as you will be forced to hold it at a certain angle, and you'll find yourself re-typing frequently due to missed key-presses. You're really better off with another RF remote.
3) Some of the keys on the new remote may not map properly, i.e. you press the key for backslash, and you get a dash symbol instead.

If my remote ever dies, I intend to replace it with this one from Lenovo. It's RF, which should make it a much better solution. It's also expensive. :(