As i have seen earlier you have the same receiver as me so i am very interested in your solution. But i am a bit puzzled, you say the amazon stick is connected to the ethernet and your receiver. Then you say you have the adaptor from Amazon. Can you please tell me what kind you are refering to as this is higly interesting for me. The only adaptors i find from Amazon are not made for this purpose.I have the adaptor from amazon.
I think i have found the adapter you have talked about now. As i can´t delete my post i am saying this to tell you that you don´t have to give detailed information. To me it was enough to google "ethernet adapter amazon fire stick" to get the answers. I will definitely try this!