Experiences with alternative Fire TV remotes/keyboards?

It’s my understanding that Amazon Fire TV boxes allow the use of alternative remote controls, and maybe even keyboards. Can anybody comment on their experiences with such things, and, in particular, how well (or poorly) alternative remotes work with Kodi for the Fire TV2 box?

I have clunky old Adesso ARC-1100 (aka Ortek VRC-1100) that I’ve been using for a long time with Kodi, and I love it because its got a mouse wheel the middle which allows moving the mouse cursor in random directions under Kodi, which sometimes seems helpful. So I’m wondering if this will work with FTV2, or what others might work which have some similar capability.

Also, I have a Logitech K400 wireless keyboard. Any chance that that will work with FTV2?

P.S. I also have a Harmony 600 lying around collecting duct that I’ve been too lazy to reprogram properly. Will that work with FTV2? It lacks a mouse wheel, but other than that, it’s pretty sweet.