I'm in a similar situation as you. I have a Logitech Harmony 900 RF remote that I use with an IR repeater. This makes programming the Flirc more difficult as I have to use a computer located close enough to the IR repeater where it can reach the Flirc. I have an Activity working for the Amazon FireTV on my Logitech Harmony 900 remote, and works fine when you then use the FireTV's remote. However, I cannot get the buttons mapped correctly on the Harmony 900 remote to work with the FireTV, so I'm also wondering which remote control I should emulate and how I'd go about doing that in Logitech's Harmony software application. I need to find some way of making the Harmony 900 send RF commands for all of the necessary buttons, which then get converted to IR and sent to the Flirc.