Hey Pandapples, my friend, after looking at the timestamps and knowing that you want to retain a rainbow-like sequence (red, yellow, green, blue, pink, white), it appears to be that we can trade Blue Feathers without changing the ordering (since my Blue Feather has a timestamp of 08-27-2016 10:50 AM) which works perfect for me since I am in need of a older Blue Feather (I would trade for the newer Yellow Feather too, but that would throw the ordering off unfortunately)!
If this sounds good to you my friend, feel free to go ahead and send the Blue Feather my way and I'll send the one I have currently your way as soon as I see the notification!
I hope you are doing really well today and I look forward to hearing back from you soon!