I would not call you an idiot,but I am missing some information to follow.
The Fire TV devices are split in
- Fire TV (flat box)
- Fire TV Stick (smaller boxes, chocolate bar form factor)
- Fire TV Cube (Cubes)
As far as I know, only the Cubes does have an IR receiver.
I know about MicroUSB-Ethernet adapter to the Stick and Cube 2nd Gen. And you are saying it is possible to add IR to (nearly?) all Fire devices?
A quick google research can’t find anything about that. Could you provide some sources?
And if you are done, it would be interesting to get a full report, to repeat this analysis for the Xbox IR feature, too